Cambridge Audio Azur 840C; reliable mods??

Hi. In addition to my VPI/Musical Surroundings Nova II analog front end, I have two CD players that I have really enjoyed. I'm thinking of parting with one of them, but having a really tough time deciding which one. I have a Cary Audio CD 303/300 unit with tubed & solid state output stages ($4,000 new), and a Cambridge Audio 840C ($1,750 new). The 840C is pretty much a "giant killer" as many have said, but I'm wondering is there are mods available that are both reliable and significant. I seem to recall an established company offering mods on this unit maybe 6 years ago, but I can't seem to find anything online now. Suggestions?? Many thanks! -David