I will most definitely level a warlock up first, since it's the class that I want to main in Warlords. It's gone through a lot of trial and error with me, getting put on the back burner when the demo nerfs happened in like 5.2 or whenever. But I eventually leveled it up and now it's my most geared toon :P I like all the specs though, afflic, demo, destro, so whichever is better for questing is what I will use.