I started with a new Alpha 9 and then bought a used CD 23 to see if I could tell a difference. I really couldn't. I liked them both so I can empathize with your dilemma. Plus they will play HD Cd's which I have few of.
Alas, the transports in both broke last year and the stock transports are not available. It would be great to know if your audio shop can find a replacement.
Jim S.