I recently upgraded my receiver and speakers thanks to a nice bonus at work. Without doing much research, I decided to go with a medium price range 7.1 set up, (Guess I figured I would stay ahead of the technology curve for a couple of years). But recently I'm starting to think this is overkill. I don't own a SACD / DVD-A player, I pretty much just use it for DVDs and as far as I can tell there aren't any 7.1 channel DVDs yet. Can anyone tell me why a 7.1 ch setup is a good idea?