Atlanta Nightlife - bar/clubs any thoughts!?

Hey live in atlanta but wanted to see if anyone new of somewhere may not have thought of yet. I'm 22, in college love 'frat bars' and 'operaish clubs. I've been to Cosmopolitan, opera Lava- this weekend wanting something more casual, if that makes since. Love Hole in the Wall, but go there a lot. Friends have condo on Lenox, and Spring was thinking walkin distant would be fabulous ;-) - but doesnt have to be! Def wanna dance, but not feeling a dresscode like Opera! Anyone got recommendations for somewhere hot?