I'm running Pally, 3xMages, and a Priest.

AOE is awesome! Could never do it right without the pally though. Wanted a warrior, but was too micro-managy.

I thought about subbing in a Warlock for one of the Mages, but the AOE is just SO nice for leveling. Kill quests are just absurdly easy.

Although, looking at the Warlock spells, it seems like a Warlock would make boss fights a LOT easier, while adding a lot of utility... Hmm...