The XA9000-ES is a very, very good transport. And it plays SACD to beat the band, as they say. I still run the XA9000ES into an outboard DAC because I like it better. They say that the XA9000ES upsamples redbook to DSD, but my DAC sounds better, so that must mean that the upsampling to DSD still needs some improvement, or else I've got an awesome DAC. I will say that the SACD playback is best of all.
Keep in mind that the SCD-1 and SCD-777ES are optimized for 2 channel. This is a key point. I actually wish I had one of those because I only do serious listening in 2 channel mode...
Cheers.