Recommend CD Player with Volume Control

I have Magneplanar 3.6Rs and Classe CAM-350 monoblocks and am looking to add a CD player. Since this will be my only source, I am looking for a CD player that has volume control/variable output and I will bypass the preamp. 24 bit, HDCD, and upgradability are definite advantages. Any suggestions in the $2000 price range (new or used)?