Spend as much as you can comfortably afford. Base that on what sounds best to you. Don't try to "proportionatley" spend an amount, or you fence yourself in or out depending on the perspective. If the CDP that sounds best in your system is within your budget buy it. If you upgrade other components, as I have heard some do, your CDP won't be out of place with its performance level. I think the only time a price point vs. system cost would apply is a cartridge on a turntable. Example I wouldn't suggest that a person buy a Lyra Titan for a Rega RP1. No insult to RP1 owners but a 4500.00 Cart on a 500.00 Table would never reveal it's potential. My advise is put the sliderule away and listen listen listen, at least IMHO.