More of a classic rock man myself.
Grateful Dead, Pink Floyd (Just spent $240 for tickets to see Roger Waters live in Seattle late may), Queen, Led Zeppelin, Rolling Stones, ACDC, Rush, Three Dog Night, etc etc.
Somewhat recently started getting into more electronic music (partly thanks to ponies), so I now have quite the collection of dubstep. Datsik, Kromestar, Capsa, Excision, Rusko, and such. Deadmau5 is also good.