Fuck all these other loser choices people have been giving you, as far as I'm concerned there is only one movie to break in on a new home theater with and that's the Fifth Element bro. The Fifth Element!
The Fifth Element is still one of the best movies to test ANY home theater with, both visually and auditory wise. It?s stunning all the way through? anyone who recommends anything else to break in a home theater system is a fucking communist.