I have 3 locks and a pally tank and pally healer, so I don't need to worry about mobility and survivability quite as much, so all I want my locks to do is pure DPS. Right now they are full on Affliction, but i just use Imps. I boosted em so much they missed the felguard and succubus quests, so i'm gonna go do those right now.

What should I spec the locks for instance running? Do I want them all the same? Or should I try to make "co builds" that compliment each other? My gear sucks, so I'm thinking something in demonology, but i'm a bit unsure as to the specifics.