Warrior + 4 Shamans is my pick for "best" endgame comp. They can still one-shot in wPVP, the multiple shamans can raid together with resto talents, and you have a tank for all content (and you boost the worst class to level: warrior). Plus these classes only get better in the long run especially TBC, and if you downsize the Warrior/Shaman combo is pretty great still.

However the warlock team does seem a lot stronger in BGs ..... but I worry about the negative reactions since multiboxers are almost as hated as much as botters