Hmmm, i second the dem francize boyz suggestion. even though they are hella black, they are hella good. If you want some good, non mainstream music check out t-nutty. he's local and sold my friend a cd out of a box in front of a liqour store but he is fucking good. mac dre would be good also. T.I.'s cd king was good, i recommend finding the instramental for "what you know" that beat alone is awesome. Hollywood Undead i been listening to a lot lately, dunno if you'd like that though. Dredg is pretty good to if your lookin for rock. For trance / techno check out hinoi team or the trance cd's from ayumi hamasaki.
Hollywood Undead T-Nutty T.I. Dredg