Rammstein (German band - can't understand half of what they say but very angry), Rage Against the Machine, Metallica (old Metallica), Static-X, and if you feel like going retro, you can't go wrong with Black Sabbath "War Pigs." Hope this is a start. :headbang
Tool or Perfect Circle......always dark.
Nine Inch Nails :headbang
Earshot (mostly there old stuff like 'misery') :headbang
Audioslave (Chris Cornell with former Rage members) :headbang