Best CD player around $2000 new or used?

Most definitely a used Resolution Audio CD 50 Can be found for $1500-$1800

most assuredly...

There a number of good CD players at this price point. ARCAM and CAL have new units under 2K. The Audio Research CD2 is considerably better than the CD1, although Northern Sound Co. can modify a CD1 and bring it to the CD2 level for about the same as the used cost difference between the two units. My personal feeling is that a late model ARC CD2 used is a sensational high-end value.

You're high enough, at $2000, to get a Wadia 830 if you're lucky, and IMHO it's in a completely different league from most that other responders have mentioned. I know of a particular one you might be able to get, for not more than $2100, so email me if you have a FIRM interest.

You should check out Linn Karik III's. With recent new models from Linn replacing the Karik after many years in production, people are selling almost-new Kariks for less than your price. A great choice if you are sensitive to "digital" sound, as it is very analog. It's also really well built and can be upgraded by using it as a transport. Also check out Meridian 508's, another great deal.