Can someone please tell the difference in sound between the 2? I have a Sony STR-DE675 AVR with 3optical inputs. Need a 4th especially with my near future upgrades. I have been looking at the Denon 2805 with 5 optical inputs, but have been reading (a few other forums) that some people "prefer" the Rotel RSX-1067 or a NAD T763. The Rotel & The Nad have 2 optical & 3 coaxial inputs. Right now I'm stuck on wanting to run everything optical. Am I right in wanting to do this? Or, is the coaxial equal to the optical? I know the optical is based on light, just asking if it matters when it comes to sound.