Metallica Black album, see how tight the drum snaps are.
Cypress Hill: Temples of boom The name says it all...very deep, very hard hitting bass...be careful, this disc hits as hard as any of those "bass mechanik" CDs.
Pick your favorite orchestral piece, that happens to have a nice deep string section...see how nice it sounds.
3 discs, one for tight snappy bass, one for sheer sound output, and one for a more complex bass.