Best CD player around $2000 new or used?


I'm looking to upgrade my Martin Logan/Sonic Frontiers/MIT system with a better CD player. Is an Audio Research CD-1 (used) good? How about Krell or Classe? Any recommendations?
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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.