Transformers is a great movie for that deep voice test. If you have Master and Commander laying around queue up the cannon ball scene and right when they give a below deck view with the camera angle see if the footsteps happening at the deck level of the ship sound like they're coming from the upstairs of your home.  One of my favorite imaging test scenes. Gets better with side speakers but very doable in 5.1. I have made many jaws drop with my Aperion / NAD system and that scene. The intro to Revenge of the Sith is pretty good too. The Incredibles has a lot of dynamic sound in it as well.

Daryl