Fourtyrulz

Motorhead - Order/Fade to Black
Kreator - Enemy of God, Murder Fantasies
Morbid Angel - Eyes to See Ears to Hear, Nothing is Not
Zyklon - Electric Current, The Prophetic Method, No Names Above the Names
Meshuggah - Any song will work really

Maybe those were too extreme for just a "Hard-n-Heavy" type CD, but you should definitely check them out anyway!

Edit: I would agree a million percent with skinny's Bongzilla recommendation! Those guys are on a different planet kind of heavy.

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the·o·ry - a working hypothesis that is considered probable based on experimental evidence or factual or conceptual analysis and is accepted as a basis for experimentation.
faith - Belief that does not rest on logical proof or material evidence.
- Merriam-Webster's dictionary