These are the talents I suggest using for raiding as a warlock.

Unstable Affliction/Destructive Reach raid build 44/0/17
"This build is a key warlock raiding build, and provides many important raid synergy effects, while providing decent damage to new warlocks."

"Malediction provides much-needed damage boost to Curse of Shadow and Curse of the Elements. Shadow Embrace reduces damage done by the debuffed target and helps reduce the healing required on the main tank. Curse of Exhaustion helps the warlock kite which is useful in certain situations, such as Vashj's Coilfang Strider adds." (For Karazhan this will come in handy for the Wizard of Oz fight.)

Recommended Stats:
7000 hp, 6000 mana, +600 dmg, 90 hit