I'm in complete agreement for a used PS Audio SACD player. As someone mentioned before: I'd also argue for the importance of the I2S/IIS (HDMI) output on any CD player. (Of course, your DAC will have to have that input.)
There is one exception to this statement. The I2S (HDMI) output from the PS player will only provide full benefit if your HDMI input has used the same pin configuration as the PS unit has for I2S. PS Audio will provide the pin configuration and even will mention the few brands that use the same configuration that they know of. This works both ways, I tried a Sony player that had the HDMI out and verified that it is not fully I2S. If you are using PS Audio player to PS Audio DAC - it is a given they are fully compatible - and musical bliss is the result! Why I2S has not become more standardized is a travesty. All components of the digital signal align with one simple cable hookup.