I'm gonna continue with my Paladin / 4 elemental shaman team.
Because with 3.5 sec cd on chain lightning, i belive paladin will be the strongest class with 4 ele shamans.
Iam gonna start PVE first off, but i want to be able to PvP. Thats why i dont do mixed team - And i simply LOVE this setup.

I find it very fun to play paladin as tank. I belive its also gonna be the tanking class with fewest tank's, hence many prot paladins now may reroll DK to acctually be able to play PvP(Alltho ret is good in wotlk)