Some of these types of bands pop up on my Pandora every now and then. How about 'Isis' or 'Gojira'. Not everything these bands do is great, and I don't know if you will like the vocals, but you should check them out.
~ UMass Paintball
~ NH Origin
~ NEPL Pump
~ MARQ 6 FS/T
Check out my brother's band, Skull Hammer