Try and get as many teams as you can. I love my druids! With that team you can have a tank, dps and healer. Plus just fun world pvp if you do that kind of thing.

One thing to think about. Blizz is know to either overpower or nerf classes from time to time. The more classes you have the more advantage you would have down the road. After I get all my current teams to lvl 80 I plan on doing another RAF and getting the rest of the classes taken care of.