If you end up with the 963, let it run 24/7 for 6-7 days before doing any serious evaluating on redbook, same goes for sacd..
Use the 6 channel outs as they use superior sounding op amps and cap.
I added a used Virtual dynamics power 3 for 50.00 that lowered the noise floor quite a bit.
I also want to mention that any aftermarket pc will plug into the back of the 963 without a 2-3 prong adapter, and the unit responds well to high quality ic's and isolation tweeks, as well as Cardas caps for the unused rca outs.