Damn, some really really good responses! I half expected to see ALL rap and /or dance stuff.
Agree with T3ase on the Prodigy and Crystal Meth. And damn if I wasn't gonna say Slipknot hits hard as hell if your subs can keep up with them!
Here's my list of favorites
Rock: Kyuss: Caterpillar March, Sepultura Chaos A.D. , NIN - Down in it, Anything with a standup bass like Tiger Army or the Flametrick Subs
Rap : The entire Westside Connection Album(I had to relocate my Cd changer from the back of my Jeep just so I could play this album without it skipping)
and don't forget the good ol 1812 overture!