You could use the toslink or coaxial digital output, and use the changer as a transport for a better expternal DAC. If you don't want to do that, the Harmon Kardon and Denon CD changers look decent to me, but I've not heard them. A DVD changer would allow you to play 24/96 audio discs, as well as CD's and DVD movies.
CD Changers
I'm looking for any information on any High-End, or at least better than average, CD changers. I have a Technics SL-PD947 it's got some great features and all, but I know I'm missing out using this as a source. I'm just trying to find something good for continues music during parties and working around the house. Hope you can help.