After trying and failing to level several alts, I've decided to try Dualboxing as a way to make the grind to 70 a bit more fun.

I've decided that one of the classes I want is a Druid, but I'm a bit more fuzzy on the other. I already have a high-level mage, priest, warlock, and hunter, so I'm wondering what a good class to complement the druid would be.