After a loooong while I found my thread again.

Well, the Aggro shouldn't be of a problem since you can simply watch who has got how much threat by the time.

But I thought about boxing with:

Druid --> Balance Talent for -hit for enemies
Hunter --> -hit shot
Shaman --> +agi totem
Paladin --> Kings for more agi
Rogue --> The tank.

I didn't calculate anything by now. Still looking for bosses where it would make sense to tank like that. I mean, it would be awesome if I could solo some bosses from raid instances :P
My actual problem is - My knowledge about rogues, shamans and hunter is limited, never played them too far. Further I have to look how much gear my rogue would need to reach the perfect evasion.