I'll give you a few of my favorite bands:
Disturbed (My Brothers-My Sisters-My Blood-SPEAK TO ME!!!!!!!!!!!) I am a Proud Disturbed One for Life
Avenged Sevenfold (Nightmare was Amazing, RIP their member that passed away (I believe it was the drummer))
Godsmack (Sully Erna's solo album is Amazing As Well!!!!!)
Metallica (I know they have bitched and screamed, and they've had issues out the yin-yang, but I just can't help but LOVE the Music!!!!!)
Eminem (Evey Metal Loving White Boy, needs a little Rap here and there (VERY LITTLE RAP))
Lamb of God (Recently got turned on to these guys, and they I Love it!!!!!!!!!)
Dope (A very underestimated band, they have some Truly Bad Ass Songs)
ICP-Dark Lotus-Twiztid (Got to Love the Clowns from time to time)
Dead Season (a rarely herd of band but an Awesome one none the less, if you'd like to check a song of there's, check out there cover to "Thunder Rolls", It's Awesome!!!!!)
Demon Hunter (The Christian Death Metal Band (yeah it does exist lol))
Jedi Mind Tricks (if you haven't herd of these guys, you should really check them out, however they are not for the closed minded)
Tool-A Perfect Circle-Puscifer (Amazing Bands All!!!!!!!)
Korn (Loved Em' Years Ago, Love Em' Now!!!!!)
Slipknot-Stone Sour (Corey Taylor is a Genius)
System of a Down-Scars on Broadway (Wish they were still together)
Marilyn Manson (love him, or hate him, you have to give the guy credit for being able to sell the image he created)
Rammstein (can't understand a word they say, but that doesn't make it any less Awesome!!!!!!!)
Mudvayne (Head Banging Metal at it's finest)
Well now that I've gone down about a fourth of my itunes, I guess I'd better stop
lol.