Alright, so I have been doing some more thinking, and I am thinking of doing the DK tank at level 58, and just using a warrior up until then.

So I am thinking doing...

Death Knight Tank
Druid Boomkin
Shaman Elemental
Mage Fire
Priest Healer

It should give me great buffs for all the toons involved. Thanks Genocyde for the ideas. And everyone else.