Seeing as I already have 1 70 paladin (and am boosting another so i can boost other toons on my main acct, currently lvl 56) I went with 5x shaman. I can then have both options. Run em with my pally for real tanking, run em x5 if i want to keep it simple, drop 2 and use pally tank priest healer for holy trinity, and I have other healers I could use, including a lvl 30 shaman...

And just seeing how much 5x shaman can PWN, made me go that route. I find that it's simpler to MB a class with fewer spells of one type. My Priest has so many healing spells, it's hard to keep track of which one is the ideal one at the moment. But my pally healer is simple. Big heal/Small Heal. Shaman is Lightning bolt/chain lighting. The rest of the spells are more situational, like shocks, etc. When I really want a challenge, I will roll a warrior tank, priest healer, and 3x mages. (mages have so many DPS spells its insane!) But that will be later.