For sheer astonishment factor, I'd seriously recommend people check out
Car Bomb -
Cielo Drive is a BAD ASS song. If you like it, they are consistently amazing, & are well worth checking out.
Another face destroyingly heavy band are
Burnt by the Sun.
Cephalic Carnage are also retarded technical, even more so, in fact! A little more heavy, death/grind mix, with some stoner riffs thrown here & there. But, very well done - all their riffs are coherent a well written. They are SICK. & big smokers - have blazed with em' before. I even have a Cephalic Carnage brand SSV vaporizer. xD
&;
The Locust! Well... prepare yourself to be appalled by some wierd music.