Druids change completely once you get your forms. before level 10 you are basically a gimped priest, so just burn through the first few levels, (having 3 makes it easy, as you can usually one shot with 3x wrath) and once you get cat form, then the fun starts! IMO most classes, other than casters suck completely at low levels, because you can't do the stuff that that class is 'known' for until you learn the spells. Like shaman totems, you can't use em all for a while.

I say, keep with the lock mage priest for now, it's a fun, and useful combo. Make the lock demonology, and get a felguard tank, priest shadow, and mage can be anything, I like Fire for long range (helps when /follow ing) Arcane is good as well. I have a priest 4 mages and 3 locks, but I haven't played em all together yet. I think I wanna swap one of my locks for one of my mages, once I Hit 80 on both teams. Mixed is very useful in the long run.