I have a YBA CD1a and find it extremely musical. It has that rare quality of a highly detailed sound without any glare or harshness. Put it this way - I don't have the upgrade bug I once had. That said, the CD1a is slightly long in the tooth - like Rcprince mentioned, the Audio Aero Capitole is reputedly king of the hill now at the sub $10k level. I haven't head the Capitole, but I also haven't heard anyone who did hear it claim it to be anything less than almost perfect. Strange that the French have such a way with digital perfection...
http://www.audaud.com/audaud/JAN02/EQUIP/equip3JAN02.html
http://www.audaud.com/audaud/JAN02/EQUIP/equip3JAN02.html