Equipment:
Head:
1. [Faerlina's Madness] (Naxx25, Faerlina) 276 dps
2. [Hood of Rationality](Malygos25) 276 dps
3. [Enamored Cowl] (?) 254 dps
4. [Cowl of Vanity](Naxx25, Grobbulus) 250 dps
5. [Valorous Plagueheart Circlet] (Naxx25, Kel'Thuzad) 249 dps
6. [Gothik's Cowl] (Naxx25, Gothik) 231 dps
7. [Heroes' Plagueheart Circlet] (Naxx10, Kel'Thuzad) 227 dps
8. [Cowl of Winged Fear] (Naxx10, Sapphiron) 213 dps
9. [Cowl of Sheet Lightning] (Naxx10, Thaddius) 213 dps
10. [Deadly Gladiator's Felweave Cowl] (Season 5) 212 dps
11. [Visage Liquification Goggles] (Season 5) 207 dps
12. [Forgotten Shadow Hood] (Stratholme Heroic) 199 dps
13. [Crown of Unbridled Magic] (The Oculus Heroic) 195 dps
14. [Hateful Gladiator's Felweave Cowl] (Season 5) 194 dps
15. [Cowl of Innocent Delight] (Naxx25, Loatheb) 189 dps

Neck:
1. [Wyrmrest Necklace of Power] (Quest Malygos25) 183 dps
2. [Chain of the Ancient Wyrm] (Quest Malygos10) 166 dps
3. [Chain of Latent Energies] (Naxx10 Trash) 149 dps
4. [Thunderstorm Amulet] (Naxx25) 146 dps
5. [Deadly Gladiator's Pendant of Ascendancy] (Season 5) 143 dps
6. [Encircling Burnished Gold Chains] (EoH Vendor) 132 dps
7. [Circle of Arcane Streams] (Sartharion10) 130 dps
8. [Necklace of Taldaram] (Ahn'Kahet Heroic) 129 dps
9. [Deadly Gladiator's Pendant of Ascendancy] (Season 5) 128 dps
10. [Cosmic Lights] (Naxx25, Sapphiron) 126 dps
11. [Necklace of the Glittering Chamber] (Malygos10) 125 dps
12. [Torque of the Red Dragonflight] (Malygos10 Quest) 119 dps
13. [Veiled Amulet of Life] (Naxx10) 115 dps
14. [Deadly Gladiator's Pendant of Subjugation] (Season 5) 111 dps
15. [Titanium Spellshock Necklace] (JC) 109 dps
16. [Chains of Adoration] (Naxx25) 109 dps
17. [Bone-Linked Amulet] (Naxx10) 108 dps
18. [Volitant Amulet] (Sartharion10) 108 dps
19. [Ceaseless Pity] (Naxx25, Sapphiron) 107 dps

Shoulder:
1. [Mantle of the Fatigued Sage] (Naxx25) 207 dps
2. [Mantle of the Corrupted] (Naxx25) 204 dps
3. [Valorous Plagueheart Shoulderpads] (Naxx25) 199 dps
4. [Heroes' Plagueheart Shoulderpads] (Naxx10) 188 dps
5. [Mantle of the Locusts] (Naxx25) 183 dps
6. [Mantle of Dissemination] (Malygos25) 180 dps
7. [Deadly Gladiator's Felweave Amice] (Season 5) 147 dps
8. [Runecaster's Mantle] (Utgarde Keep Heroic)143 dps
9. [Miasma Mantle] (Naxx10) 142 dps
10. [Sympathetic Amice] (Naxx25) 141 dps
11. [Dark Runic Mantle] (Halls of Stone Heroic) 136 dps
12. [Hateful Gladiator's Felweave Amice] (Season 5) 131 dps
13. [Mantle of the Extensive Mind] (Naxx10) 131 dps
14. [Mantle of the Tribunal] (Halls of Stone Heroic) 119 dps
15. [Savage Gladiator's Felweave Amice] (Season 5) 117 dps
16. [Mantle of Deceit] (Stratholme Heroic) 114 dps

Chest:
1. [Gown of the Spell-Weaver] (Malygos10) 272 dps
2. [Ebonweave Robe] (Tailoring) 243 dps
3. [Gown of Blaumeux] (Naxx10) 241 dps
4. [Valorous Plagueheart Robe] (Naxx25) 238 dps
5. [Heigan's Putrid Vestments] (Naxx25) 236 dps
6. [Digested Silken Robes] (Naxx25) 219 dps
7. [Spellweave Robe] (Tailoring) 216 dps
8. [Blanketing Robes of Snow] (Malygos25) 210 dps
9. [Heroes' Plagueheart Robe] (Naxx10) 199 dps
10. [The Sanctum's Flowing Vestments] (Sartharion25) 197 dps
11. [Water-Drenched Robe] (Violet Hold Heroic) 190 dps
12. [Robes of Mutation] (Naxx25) 185 dps
13. [Moonshroud Robe] (Tailoring) 184 dps
14. [Robes of Lightning] (Halls of Lightning Quest) 182 dps
15. [Robes of Crackling Flame] (Vendor) 168 dps
16. [Robes of Hoarse Breaths] (Naxx10) 168 dps
17. [Sympathy] (Naxx25) 164 dps
18. [Robes of Rhonin] (Mount Hyjal) 158 dps
19. [Deadly Gladiator's Felweave Raiment] (Season 5) 153 dps
20. [Arcane Flame Altar-Garb] (Gundrak Heroic) 151 dps
21. [Ornate Woolen Stola] (Halls of Lightning Heroic) 150 dps
22. [Black Duskweave Robe] (Tailoring) 149 dps

Wrist:
Note: [Wraps of the Astral Traveler] are easy to get (just buy 'em!) and very good as long as you can use the hit rating. [Punctilious Bindings] are the best hitless alternative.

1. [Unsullied Cuffs] (Sartharion10) 153 dps
2. [Wraps of the Astral Traveler] (Vendor) 148 dps
3. [Bindings of the Expansive Mind] (Naxx25) 145 dps
4. [Preceptor's Bindings] (Naxx10) 143 dps
5. [Punctilious Bindings] (Sartharion25) 129 dps
6. [Resurgent Phantom Bindings] (Naxx10) 116 dps
7. [Cuffs of Winged Levitation] (Oculus Heroic) 114 dps
8. [Cuffs of the Shadow Ascendant] (Vendor) 112 dps
9. [Bindings of Yearning] (Naxx25) 107 dps
10. [Bands of Impurity] (Naxx25) 107 dps
11. [Deadly Gladiator's Cuffs of Salvation] (Season 5) 106 dps
12. [Deadly Gladiator's Cuffs of Dominance] (Season 5) 104 dps
13. [Azure Cloth Bindings] (Violet Hold Heroic) 100 dps
14. [Fleshwerk Shackles] (Quest) 99 dps
15. [Hateful Gladiator's Cuffs of Salvation] (Season 5) 95 dps
16. [Savage Wound Wrap] (Drak'Tharon Heroic) 94 dps
17. [Hateful Gladiator's Cuffs of Dominance] (Season 5) 93 dps
18. [Cuffs of the Trussed Hall] (Utgarde Pinnacle Heroic) 88 dps
19. [Black Duskweave Wristwraps] (Tailoring) 84 dps
20. [Focused Mana Bindings] (Black Temple) 84 dps

Hands:
Note: Naxxramas offers many good choices here and the tailors will help you out if you are unlucky.

1. [Gloves of Grandeur] (Naxx25, Sapphiron) 192 dps
2. [Gloves of the Fallen Wizard] (Naxx25) 188 dps
3. [Ebonweave Gloves] (Tailoring) 180 dps
4. [Gloves of Token Respect] (Naxx25) 168 dps
5. [Spellweave Gloves] (Tailoring) 159 dps
6. [Gloves of Dark Gestures] (Naxx10) 152 dps
7. [Valorous Plagueheart Gloves] (Naxx25) 141 dps
8. [Wraps of the Persecuted] (Naxx25) 140 dps
9. [Overlook Handguards] (Drak'Tharon Heroic) 135 dps
10. [Moonshroud Gloves] (Tailoring) 135 dps
11. [Gloves of Glistening Runes] (The Nexus Heroic) 128 dps
12. [Handguards of Defiled Worlds] (Sunwell) 123 dps
13. [Heroes' Plagueheart Gloves] (Naxx10) 123 dps
14. [Gloves of the Crystal Gardener] (The Nexus Heroic) 119 dps
15. [Handgrips of Turmoil] (Naxx10) 119 dps
16. [Deadly Gladiator's Felweave Handguards] (Season 5) 119

Legs:
1. [Leggings of the Wanton Spellcaster] (Malygos25) 335 dps
2. [Legwraps of the Defeated Dragon] (Sapphiron25) 283 dps
3. [Leggings of Atrophy] (Naxx25) 263 dps
4. [Leggings of Mortal Arrogance] (Naxx25, KT) 263 dps
5. [Valorous Plagueheart Leggings] (Naxx25) 245 dps
6. [Distorted Limbs] (Naxx25) 227 dps
7. [Leggings of Sapphiron] (Naxx10, Sapphiron) 227 dps
8. [Heroes' Plagueheart Leggings] (Naxx10) 222 dps
9. [Leggings of the Instructor] (Naxx10, Razuvious) 213 dps
10. [Pantaloons of Growing Strife] (Sunwell, Kalecgos) 209 dps
11. [Leggings of Calamity] (Sunwell, Brutallus) 207 dps
12. [Leggings of Channeled Elements] (Mount Hyjal) 206 dps
13. [Deadly Gladiator's Felweave Trousers] (Season 5) 205 dps
14. [Pantaloons of Calming Strife] (Sunwell, Kalecgos) 200 dps
15. [Leggings of Devastation] (Black Temple, Shahraz) 195 dps
16. [Hateful Gladiator's Felweave Trousers] (Season 5) 186 dps
17. [Legwraps of Sweltering Flame] (Vendor) 183 dps

Waist:
Note: [Cincture of Polarity] is a very good belt, but [Leash of Heedless Magic] has no hit rating on it and still easily competes. [Plush Sash of Guzbah] is probably easiest to get and still very good. I laughed when good old [Belt of Blasting] appeared after the computation. This is not a mistake: Just socket two (or three) [Runed Scarlet Ruby] into it and it is still a heavy dps belt.

1. [Cincture of Polarity] (Naxx25) 211 dps
2. [Leash of Heedless Magic] (Malygos25) 197 dps
3. [Plush Sash of Guzbah] (Vendor) 193 dps
4. [Girdle of Bane] (Utgarde Pinnacle Heroic) 191 dps
5. [Flowing Sash of Order] (Halls of Lightning Heroic) 167 dps
6. [Belt of False Dignity] (Naxx25) 162 dps
7. [Belt of Blasting] (BC Tailoring) 159 dps
8. [Belt of Unified Souls] (Stratholme Heroic) 154 dps
9. [Cord of Screaming Terrors] (SSC, Lurker) 151 dps
10. [Sash of Solitude] (Naxx25) 150 dps
11. [Deadly Gladiator's Cord of Salvation] (Season 5) 150 dps
12. [Sash of Jordan] (Random Drop) 148 dps
13. [Agonal Sash] (Naxx10) 147 dps
14. [Deadly Gladiator's Cord of Dominance] (Season 5) 147 dps
15. [Belt of the Malefic] (Sunwell) 146 dps
16. [Sash of the Wizened Wyrm] (Vendor) 141 dps
17. [Sash of Mortal Desire] (Naxx10) 140 dps

Feet:
The emblem sponsored [Xintor's Expeditionary Boots] are best, but loaded with lots of hit.
The best alternative are [Arcanic Tramplers] from Malygos.

1. [Xintor's Expeditionary Boots] (Vendor) 206 dps
2. [Boots of Impetuous Ideals] (Naxx25) 204 dps
3. [Arcanic Tramplers] (Malygos25) 188 dps
4. [Slippers of the Holy Light] (Vendor) 167 dps
5. [Boots of Forlorn Wishes] (Naxx25) 155 dps
6. [Saltarello Shoes] (Naxx10) 147 dps
7. [Boots of Persuasion] (Naxx25) 145 dps
8. [Titan-forged Slippers of Dominance] (?) 144 dps
9. [Serene Echoes] (Naxx25) 140 dps
10. [Sullen Cloth Boots] (Naxx10) 140 dps
11. [Sandals of Crimson Fury] (Vendor) 135 dps
12. [Boots of the Malefic] (Sunwell) 130 dps
13. [Deadly Gladiator's Treads of Salvation] (Season 5) 125 dps
14. [Deadly Gladiator's Treads of Dominance] (Season 5) 122 dps
15. [Stone-Worn Footwraps] (Azjol-Nerub Heroic) 117 dps
16. [Slithering Slippers] (Gundrak Heroic) 116 dps
17. [Cleric's Linen Shoes] (The Nexus Heroic) 114 dps
18. [The Conjurer's Slippers] (The Oculus Normal) 113 dps

Rings:
Note: [Signet of the Malevolent] and [Deadly Gladiator's Band of Ascendancy] both offer insane amounts of hit, while [Signet of Manifested Pain] from KT is definitely the best non-hit ring around. The buyable [Signet of the Kirin Tor] and [Band of Channeled Magic] are nice dps rings and easy to get.

1. [Signet of the Malevolent] (Naxx10) 151 dps
2. [Deadly Gladiator's Band of Ascendancy] (Season 5) 143 dps
3. [Signet of Manifested Pain] (Naxx25, KT) 140 dps
4. [Band of Channeled Magic] (Vendor) 127 dps
5. [Lost Jewel] (Naxx25) 121 dps
6. [Ring of Holy Cleansing] (Naxx10) 114 dps
7. [Ring of Decaying Beauty] (Naxx25, Sapphiron) 110 dps
8. [Signet of the Kirin Tor] (Vendor) 110 dps
9. [Wyrmrest Band] (Sartharion10) 110 dps
10. [Band of Guile] (Stratholme Heroic) 109 dps
11. [Annhylde's Ring] (Utgarde Keep Heroic) 108 dps
12. [Timeworn Silken Band] (Naxx10, 107 dps)
13. [Seized Beauty] (Naxx25) 106 dps
14. [Ring of Northern Tears] (JC) 105 dps
15. [Renewal of Life] (Vendor) 102 dps

Back:

1. [Deadly Gladiator's Cloak of Ascendancy] (Season 5) 143 dps
2. [Cape of the Unworthy Wizard] (Naxx25, KT) 139 dps
3. [Dark Shroud of the Scourge] (Naxx10) 138 dps
4. [Disguise of the Kumiho] (Vendor) 128 dps
5. [Hateful Gladiator's Cloak of Ascendancy] (Season 5) 128 dps
6. [Pennant Cloak] (Sartharion10) 125 dps
7. [Deathchill Cloak] (Tailoring) 122 dps
8. [Shawl of the Old Maid] (Naxx25) 122 dps
9. [Shroud of Luminosity] (Naxx25) 120 dps
10. [Deadly Gladiator's Cloak of Subjugation] (Season 5) 111 dps
11. [Shroud of the Citadel] (Naxx10, Sapphiron) 108 dps
12. [Cloak of Kea Feathers] (Vendor) 107 dps
13. [Deadly Gladiator's Cloak of Deliverance] (Season 5) 106 dps
14. [Cloak of the Dying] (Naxx10, KT) 106 dps
15. [Cloak of Averted Crisis] (Naxx25) 106 dps
16. [Cape of Seething Steam] (Halls of Lightning Normal) 105 dps

Trinkets:
This will take a while. Many interesting trinkets have "on cast"-procs, making it difficult to give a good computation of their dps-values. So far, I recommend reading the trinket thread in this forum.

1h-Weapon:

Note: [The Turning Tide] is the absolute weapon at the moment. It has the highest dps-output possible because of an insane amount of spell power, and it has no hit rating at all, making it very flexible to combine with any equip.

1. [The Turning Tide] (Naxx25) 728 dps
2. [Haunting Call] (Naxx25) 682 dps
3. [The Soulblade] (Naxx10) 670 dps
4. [Life and Death] (Naxx25) 641 dps
5. [Deadly Gladiator's Spellblade] (Season 5) 622 dps
6. [Blade of Dormant Memories] (Naxx10) 569 dps
7. [Grieving Spellblade] (Naxx10) 569 dps
8. [Hateful Gladiator's Spellblade] (Season 5) 551 dps
9. [Cursed Lich Blade] (Drak'Tharon Keep Heroic) 528 dps
10. [Flameheart Spell Scalpel] (Vendor) 527 dps

2h-Weapon:

Note: 2h-weapons are inferior to 1hs + offhands.

1. [Greatstaff of the Nexus] (Malygos25) 735 dps
2. [Deadly Gladiator's Focus Staff] (Season 5) 732 dps
3. [Staff of Restraint] (Sartharion25) 679 dps
4. [Spire of Sunset] (Naxx25) 671 dps
5. [Sulfur Stave] (Naxx10) 667 dps
6. [Deadly Gladiator's War Staff] (Season 5) 659 dps
7. [Deadly Gladiator's Energy Staff] (Season 5) 649 dps
8. [Hateful Gladiator's Focus Staff] (Season 5) 647 dps
9. [Deadly Gladiator's Battle Staff] (Season 5) 644 dps
10. [Charmed Cierge] (Naxx10) 631 dps
11. [Staff of Draconic Combat] (Oculus Heroic) 624 dps
12. [Damnation] (Naxx25) 616 dps
13. [Hateful Gladiator's War Staff] (Season 5) 583 dps
14. [Hateful Gladiator's Energy Staff] (Season 5) 574 dps
15. [Hateful Gladiator's Battle Staff] (Season 5) 570 dps
16. [Savage Gladiator's Focus Staff] (Season 5) 564 dps
17. [Grand Staff of Jordan] (Vendor) 546 dps
18. [Staff of Wayward Principles] (Utgarde Pinnacle Heroic) 542 dps
19. [Staff of Sinister Claws] (Ahn'kahet Heroic) 539 dps
20. [Grand Magister's Staff of Torrents] (Sunwell) 519 dps

Offhands:
The EoH-Offhand is suprisingly good and should be one of your first buys if you can get an appropiate main hand weapon.
1. [Surplus Limb] (Naxx25) 157 dps
2. [Ward of the Violet Citadel] (EoH-Vendor) 144 dps
3. [Watchful Eye] (Naxx10) 137 dps
4. [Matriarch's Spawn] (Naxx25) 127 dps
5. [Telestra's Journal] (Nexus Heroic) 125 dps
6. [Accursed Spine] (Naxx25) 120 dps
7. [Handbook of Obscure Remedies] (EoH-Vendor) 112 dps
8. [Deadly Gladiator's Reprieve] (Season 5) 106 dps
9. [Urn of Lost Memories] (Naxx25) 106 dps
10. [Deadly Gladiator's Endgame] (Season 5) 104 dps
11. [Scepter of Murmuring Spirits] (Naxx10) 95 dps
12. [Hateful Gladiator's Reprieve] 95 dps
13. [Temple Crystal Fragment] (Drak'Tharon Heroic) 93 dps
14. [Hateful Gladiator's Endgame] (Season 5) 93 dps
15. [Blind-Seers Icon] (Black Temple) 91 dps
16. [Deadly Gladiator's Grimoire] (Season 5) 90 dps
17. [Chronicle of Dark Secrets] (Mount Hyjal) 89 dps
18. [Iron-bound Tome] (Inscription) 87 dps

Wands:
1. [Gemmed Wand of the Nerubians] (Naxx25) 88 dps
2. [Wand of the Archlich] (Naxx10, KT) 72 dps
3. [Plague Igniter] (Naxx25) 69 dps
4. [Wand of Cleansing Light] (Sunwell Trash) 68 dps
5. [Wand of the San'layn] (Utgarde Keep Heroic) 66 dps
6. [Wand of the Demonsoul] (Sunwell Trash) 66 dps
7. [Wand of Blinding Light] (Quest) 63 dps
8. [Fading Glow] (Naxx25) 61 dps
9. [Deadly Gladiator's Baton of Light] (Season 5) 59 dps
10. [Deadly Gladiator's Touch of Defeat] (Season 5) 59 dps
11. [Wand of Ahnkahet] (Ahn'Kahet Heroic) 57 dps
12. [Ancient Measuring Rod] (Halls of Lightning (normal)) 57 dps
13. [Touch of Horror] (Naxx25) 56 dps
14. [Rod of the Fallen Monarch] (Azjol-Nerub Heroic) 56 dps
15. [Hateful Gladiator's Baton of Light] (Season 5) 53 dps
16. [Hateful Gladiator's Touch of Defeat] (Season 5) 52 dps
17. [Contortion] (Naxx10) 51 dps
18. [Wand of Prismatic Focus] (Black Temple) 51 dps
19. [Wand of the Forgotten Star] (The Eye) 51 dps