Most Helpful Guy
Well, if you like Machine Head then try Fear Factory, Pantera, Lamb of God, and Devildriver.
I don't listen to much metalcore and I definitely don't do nu-metal but I also know of: Trivium (older albums), Parkway Drive, Killswitch Engage, August Burns Red, All That Remains, Unearth, God Forbid, and As I Lay Dying.
Most Helpful Girl
For nu-metal Infected Rain
I love them they are so good they are a little Moldovan band
Plus I have the biggest crush on their vocalist Lena