I am in the middle of deciding which dvd player to buy, but am still somewhat confused about all this AV stuff. I was making a shortlist that included DVD players that are also good at playing CD's and DVD-A. But having read a review about something or other in the last ten minutes, I suddenly wondered if I am wasting my time! If an AV amp has it's own digital to analogue converters, who cares how well a CD player plays CD's? I mean it is all down to the AV amp, isn't it?? Should I only be concerned about the picture quality of the dvd and leave all the sound to the AV amp??? 1. Can I play cd's through the digital coax? 2. What about DVD-A and SACD?