I'd say Hydraxis. Our guild has 4 folks with multiple accounts (though only 3 that MB atm). We were doing Kara regularly and getting ready for ZA when we lost our main tanks. Due to Xpac, we're not even concerned with raiding anymore (though should be back in Kara within the next 2 weeks with newly geared tanks with any luck). Guess it might not be a good fit if you're in a hurry to raid. Getting ready for Northrend (daily gold and leveling alts). :|