Try a 0/21/40 warlock.  They can be 900 DPS on single targets without any buffs or consumables, with only Fel Armor on and the Succubus sacrificed.  The problem with it is that you lose damage on say Gruul and Maiden when you have to move around or you get stunned (the spec makes you lose DoTs, but with 1000 shadow damage, you put out 2400 non-crit Shadow Bolts, and they can reach up to 8000 crits when stacked properly and using buffs and consumables).  I have yet to try it with a shadowpriest on the raid, but I'm sure the Shadow Bolt crits will reach a LOT higher.

It's a great raid spec, great burst DPS for soloing, but the survivability of it soloing against more than two mobs can be painful.

http://www.wowarmory.com/character-sheet.xml?r=Hellscream&n=reldor

That's my warlock built as 0/21/40.