Whilst I was deciding on a PvE team, I fairly quickly came to the conclusion that Warrior, Priest, 'Lock and 2 Mages would be the way to go. In short, its a group that has *everything* you would need. Depending on where you want the groups strengths to lie, you might think about swapping out the 'lock for an Enhancement Shammie, for the extra Buffs and off-tanking. The obvious disadvantage of this is the distinct lack of wipe-recovery.