I understand how you feel about Sony's. They just don't seem to have that R2R magic. somehow Sony sucked all the life out of the sound. I have a 2 TC-650's, a 640 and a 580. Out of them all, the 580 is the nicest, but still nowhere near the sound of my Akai GX-260D, that baby sounds sweet. I would like to move up in the chain a bit, but I don't have enough prerecords to make it worth it, and I am considering a move up in my vinyl rig, which I use most every day.
Which Sony are you using? I can't remember.