Serenity is my favorite disc for showing off the subwoofer. I recently upgraded to the BD but the DVD was pretty cool, too.
I'm running a single Hsu VTF 3.3 at max extension (~16Hz) using a fraction of it's power to fill a 2500 ft^3 room. I love the subsonic stuff for HT but organ music with a 32' pipe makes me want to heave.
Jim