5.1 is a thing of beauty. But I made the jump to 6.1. And its even better. Try Pirates of the Carribean, or Underworld. They have a discrete rear center channel. A few more are out there.
One poster said they were not sure about surround for music only. Watch the Cream DVD from Albert Hall. Amazing sound. Anyone thinking of these new "sound bars"...forget it. You have to move air. And separate speakers do that.