Well, since I'm more of an old school Rock'n'Roll kind of guy, I'd say bands like Mot?rhead and AC/DC (please, no debate whether they're metal or not :P), but lately I found Anthrax a bit interesting as well. For the record, I used to be a Sabbath and Maiden fan. Still listen to their music every now and then.
But truth is: No other band
rocks like the deranged accadacca. Evidence:
http://www.youtube.com/watch?v=uUiehLy-cLY