Yeah, but that could get expensive. My latest RAF round I did 4 teams to 60, twice (locks, mages, shamans, and priests). I'm finding that I don't really enjoy any class that can't heal, so I'm hoping I never want warriors/rogue/hunters (already have pallys and druids 60+, don't count DKs since that would be easy).

I really doesn't take that long. Just get 4 vanilla accounts, boost two old + two new, then boost the other two old + two new, and you'll have all the teams you want at 60 well before the expansion.