In no particular order. . .
Haste the Day - I can't believe I haven't seen there names in this thread yet. There lyrics are unbelievable and actually have meaning behind them. I love everything from When Everything Falls.
Mushroomhead - Always have been a fan. There music really knows how to get me excited and pumped. I wish that Slipknot hadn't come along and completely stolen their concept. . .
Atreyu - I am absolutely in love with everything they made up until Lead Sails and Paper Anchors. I wish they hadn't sold out. . . Ex's and Oh's has to be one of the best written songs I've ever listened too.
Disturbed - Gotta love them. There music is always brand new and original. I could listen to them for years and not get tired of what they're producing.
Green Day - One of the best bands ever to see live IMO. I love everything they've ever produced, even the criticized 21st Century Breakdown. One of the first bands I ever got obsessed with.