PS Audio Ultralink DAC vs newer CD player

Hi All,

I currently have an Esoteric P-500 transport (from 1993) and a PS Audio Ultralink DAC. I am wondering how this set up compares to newer CD players like Cambridge D500SE or 540C. My budget is around $400 and I prefer to buy used equipment. The rest of my system consists of these:
Thiel 3.5 speakers
Legacy High Current amp
Creek OBH-12 preamp
Tara Labs RSC cablings

Thanks for you inputs.