I want to 3 box, (its all I can afford) and was wondering if it would be possible to still do instances before the mobs gray out. Obviously I need a dedicated healer and tank, as well as dps. I'm thinking of doing a pally, priest and lock. If I take my time and make sure I always have fm and health before each pull I think its doable. I'll be going horde and probably do all blood elves. for the classes I'm looking at I don't really see any difference as far as racials goes for those classes. I'm fairly certain I won't be able to do instances all the way to 70, but I just thought I'd throw it out there and see if anyone has any thoughts on whether or not it was doable.

My thoughts on the group roles:

Pally can buff, help heal in a pinch, ae taunt etc.

Lock can offtank, wipe prevention, dot like mad and ae if necessary

Priest can buff and heal

I wonder if a mage would be better, but I think a lock is easier to control (I have a 70 lock so really familiar with the class)