Seldum, i would go for something as easy and original as tank + 4 shamans.

I only got 1 team. My main prot paladin, and four shamans. But oh, i can do anything i want. This setup is just the allround most flexible, you can do pve, pvp, instances, whatever you like. You can even go all melee if thats what you want, and have 1 spec resto instead.