Before buying, I suggest you visit tweakaudio.com and read about his modifications and comments on the Sony's. Also, I don't know about the 777es, but the 222 and 555 are being sold new for $400 and $600, respectively, with rites of return. I have found that the 555 is a very good cd transport (for a changer) which may be a consideration if you don't like its redbook performance.
CD v. SACD
I was planning on buying a new CD player (Rega Jupiter 2000), when I read a few reveiws of the Sony SCD-XA777ES, which used, I could buy for about the same amount as the Rega new. I currently have an extensive CD collection, but no SACDs. My question is whether I should just go ahead and buy the Sony, or whether a dedicated CD player, like the Rega (or others at its price point) are significantly better in their CD playback. Thanks. Tom