Best Tube CDP for $2000 Budget

My Favorite CDP is the Audio Aero Prima - smooth, detailed, with the most realistice portrayal of instruments I have heard to this point. I left some more detailed comments here:
Audio Aero Prima 24/192 Mk II cd player......
My impression since then has not changed. The Prima is still difficult to beat at this pricepoint for a CDP (compared to the Linn Genki, Unison Unico CDP, and even my previous favorite the Planet). Also, I was never very impressed with the Cayin CDPs that I listened to.

Finally one more alternative: Have you considered a PC based system? Computer audio has come a long way and there are excellent dedicated USB DACs available. I currently use the Wavelength Brick and althought the sound is a bit different with the right tubes it does offer an improvement in most areas over the Prima.

Your best bet is to listen for yourself...

have you heard the unison players ??

I have - it is probably some of the most awful sounding gear out there (even my Wife thought so). Slow, lifless, with tonal balance that was always off in one way or another even for different tubes: Exaggerated midbass and lower midrange, grainy highs. The Audio Aero Prima is much more well balanced, detailed and resolving with better instrument separation and more realistic portrayal of instruments. Of course only my own experience, and your might vary, but I could not get it to work with several different amps (amongst other the Unico integrated).