BEST DVD's to show off my NEW/FIRST surround setup?

I just got an Onkyo HT-S760 Home theater setup with Onkyo DV-CP701 5-disc CD changer. So far I'm amazed with it's performance, but i'm also coming from just stereo sound out of the TV's speakers.

I have watched The Fellowship of the Ring and Gladiator, which both sound great, but I was wondering what are some of the best DVD's to showcase the surround setup? I've heard U-571 is absolutely amazing. I also got The Two Towers for Christmas and I have high expectations for that as wel..

Any suggestions are welcome, thanks!

The first 30 minutes are just stupifyingly good. Play it loud if yer speaks can take it. The Matrix is also a fine show off yer system DVD.

Surprisingly good movie and great surround effects, bullets flying, airplanes flying around and lots of explosions. I had no intentions of watching this movie. I got it in a 2 for 1 package deal with The Rock. The Rock's sound was disappointing however when I watched Pearl Harbor, comes in DTS, I discovered an assume movie. Both Star Wars are good to show surround as well. If I remember correctly I think the 2nd X-men was pretty good.