Tulane,

Surprised about your choice of DVD Movies to demo. If you are talking just a purely demo sense then movies by Pixar demo wonderful surround around:

The Incredibles
Finding Nemo

And nice earthshaking movies like:

Saving Private Ryan
War of the Worlds
UH-571

will definitely wake your audience up with bass.

For pure alternate music bliss, a great selection is

Blue Man Group Audio in DVD-Audio

Gives you bass, nice dynamics, and surround around music all in one.