Having owned three Cambridge players (including the original 640,) I'd say they have a definite house sound which may or may not be your cup of tea. They are a good value soundwise, but I think they are a bit analytical and reserved sounding. The 640 made a great transport though. If you're looking for a good value, www.accessories4less.com is selling the Onkyo 7555, Marantz SA8001 and Marantz SA8260 players for deep discounts. I'd rather have either of those players than the Cambridge myself.
cd player upgrade
I'm looking at finally dumping my Adcom cd changer for a quality single disc player. One of the players that has piqued my interest is the Cambridge 640C w/dual Wolfson DAC's. Would this dual Wolfson DAC player render my external Lite Audio DAC60 w/pair of Amperex 7308's pointless? If so, should I look towards something like the Music Hall CD25-2?