Stuck Mojo. I'm not much into the rap rock thing, but these guys throw it down, and without record scratches or synths. They are not together anymore, but their albums are still available..Note, they were doing the rap-rock thing way before Limp dickzit came around.....
Fugazi. Another one that is well know, but not mainstream. Pretty much a hard rock/metal jam band.
Check out my band:
Havoc Din
Havoc Din