My favorite individual track is "Hey Nineteen" from the Steely Dan "Gaucho" DTS disc. The bridge is amazing! I use it to show off my system to everyone I can get on my couch.
I then follow it up with my favorite (demo) audio disc, Ladysmith Black Mambazo's "Long Walk to Freedom" SACD. This disc will take your breath away. Sarah McLachlan, Taj Mahal, Zap Mama, and others, cover LBM songs, while LBM backs them up with their amazing vocals - in (very well produced and executed) surround sound. Find it at www.headsup.com
or the Telarc website. You won't be sorry.