I'm going to try all 9 classes as same-class combos. Some I'm sure I'll give up on real quick, like rogues. Mostly just goofing off, nothing real serious here.

i have 5 hunters to 24 and 5 shaman to 26. Will try mages, priests and warlocks soon.

I plan for the Shaman to go all the way to 70 as they've been shown to be viable.

I already have a 70 Pally (not well geared tho) who I can substitute in when I get to 70 and find that I really do need a real tank.