I picked up some demo DVDs off of eBay in the past. The most recent is chocked full of just movie trailers. ALl are in Dolby Digital 5.1. The first demo DVD I got last year was some trailers, but mainly clips from movies in both Dobly Digital 5.1 and DTS. They both include Dolby, DTS, and THX trailers. All have great sound and good picture. I know that it may be too late for an eBay purchase, but maybe someone closer to you has one.
Otherwise, I like the "Tumbler" sequence in Batman Begins, or the Lexus car factory scene in Minority Report (great bass). Saving Private Ryan has unbelievable effects in the opening 30 minutes, but it is hard for some people to watch.
Here are some favorite movies from people here (did a quick search)...
Jurassic Park (DTS)
Indiana Jones DVDs (did any awesome pan job with the surrounds)
Master and Commander (hated the movie, loved the surround)
Lord of the Rings Extended (DTS-ES)
Gladiator (DTS)
Neon Genesis Evangelion Platinum Series
The Eagle's Hell Freezes Over (wow...wow)
Saving Private Ryan (DTS)
Finding Nemo
S.W.A.T. opening scene
Jurassic Park (DTS)
Indiana Jones DVDs (did any awesome pan job with the surrounds)
Master and Commander (hated the movie, loved the surround)
Lord of the Rings Extended (DTS-ES)
Gladiator (DTS)
Neon Genesis Evangelion Platinum Series (coming to US fans this summer, I hear it is awesome!)
The Eagle's Hell Freezes Over (wow...wow)
Saving Private Ryan (DTS)
Finding Nemo
Star Wars 1,2,3 (light sabers are cool)
Titan AE
The Last Samaurai
The Italian Job - intro music was made for Axioms
The Time Machine - Dream Works version
Kill Bill - plummy tube amped electric guitar.
T3
Harry Potter and the Sorcerer's Stone - Quidditch match
Any of the Lord of the Rings movies
Black Hawk Down
Blue Crush
Bourne Identity
The Haunting - Bass
Independence Day
Last of the Mohicans
Mission to Mars
Open Range
The Patriot
Seabiscuit
U-571 - Depth charges
We Were Soldiers
Good luck!
