Answering my own thread, I bought the SCD-777ES, which I am using with a Dodson DAC. The Sony has about 800 hours on it. It sounds full and smooth. It also sounds very dark and lacks detail (those two tend to go together). Add to that the fact that the unit is very annoying to use (it takes forever to read a disk and then to read the TOC), and I'm thinking this may not have been a good choice. I hate to start looking for transports in this time of digital transition, but....
As for SACD, it certainly sounds promising, but I think it could sound a whole lot better than it does with this unit. Incidentally, I have found the tonality of the Sony (smooth, dark) holds forth in SACD, transport, and CDP modes. My conclusion: the 777 has a pervasive sonic signature that comes from the transport end, not from the analog output. That surprises me. Am I doing something wrong?