Back to your original question: I have a 950 connected to a Parasound HCA 1205-A. I enjoy putting on a show for guests. Some of the DVDs I throw in when they come over are:

• Saving Private Ryan - During the beach landing scene near the beginning, listen for bullets to ricochet off the tank traps and splash in the water behind you.
• Star Wars I - During the pod racing scenes, listen for the synchopated engine noise of the pod racer to fly from left to right.
• Star Wars II - During a scene where the heros are chased through an asteroid cluster, turn it up loud and listen to the dynamic range and noise floor. When they release a mine from their ship, the soundtrack goes silent, and then there's a huge explosion with a (buzz-like?) sound.
• Moulin Rouge - During the Can-Can, listen for the sound of clothes shuffling under the music. Also, during the same, there is a short cut of a man playing a tuba or brass instrument. His playing should come through loud and clear on the center channel during that brief cut.
• Monsters Inc. - Has a option where you can play only the sound effects track; no dialogue. It's really interesting... for about 5 minutes. This DVD also has a DTS surround sound into (DTS advertisment). It's a short movie clip that plays once you select DTS playback mode.
• James Bond, Tomorrow Never Dies - The opening sequence has a lot to test your subwoofer and system's clarity.
• Eagles, Hell Freezes Over (DTS) - The Hotel California cut is a classic remade.
• Fleetwood Mac, The Dance DVD - The cuts near the end seem to be mixed better. I personally like to listen to "Rhiannon". The USC Marching Band joins Fleetwood Mac in the song Tusk, and the band is supposed to be in the rear speakers, but the mix does nothing for me.

As an anecdote, I was alone at home on night watching "James Bond, The Living Daylights" when a streetcar came up from behind on the soundstage, but was still off camera. I stopped and restarted the movie twice thinking the noise was somebody in the kitchen
Happy Listening!