I've seen My Morning Jacket in concert and yes, they're a good band to see, although they can get a little "jammy" sometimes. But they do keep it to a minimum and if you don't mind jam bands, then they don't get much better.
My SXSW concert recommendations:
Handsome Furs, Fri. March 14th at Bourbon Rocks Patio - not a great one for Rock Band but frontman Dan Boeckner's other group, Wolf Parade, would probably be great...he's like the Bruce Springsteen of indie rock, very passionate vocal delivery
Destroyer, Fri. March 14th at The Parish - Dan Bejar's band, he also does several songs on each of the New Pornographers' albums, you may have heard of them
Okkervil River, Sat. March 15th at Stubb's - and speaking of the New Pornographers, I'll be seeing this band open for them next month...their songs "For Real" and "Black" would make great DLC (if someone could link the videos that would be cool, I'm new here)