Taken from World of Logs rankings on the heroic festergut fight, using a median ranking of dps records so its not overly skewed by the very top players. This is what a typical full 277 character in each spec can expect to do on a nuke fight, or as close an estimation as possible. :)
1) Fury Warrior 18107
2) Fire Mage 17799
3) Combat Rogue 17671
4) Retribution Paladin 17213
5) Assassination Rogue 17052
6) Marksmanship Hunter 17021
7) Feral-Cat Druid 16689
8) Unholy Death Knight 16540
9) Affliction Warlock 16144
10) Frost Death Knight 15985
11) Shadow Priest 15807
12) Arcane Mage 15414
13) Demonology Warlock 15396
14) Enhancement Shaman 15275
15) Balance Druid 14924
16) Elemental Shaman 14538
17) Blood Death Knight 14276
18) Destruction Warlock 14157
19) Survival Hunter 13997
20) Arms Warrior 12563
----non-viable dps specs----
21) Beast Mastery Hunter 9496
22) Frost Mage 8257
23) Subtlety Rogue 8047
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Ere yet they blind the stars, and the wild team, Which love thee, yearning for thy yoke, arise, And beat the twilight into flakes of a fire
