I'm using a Graham Slee CuSat50 between my sacd player and my preamp. It sounds excellent. I bought a second CuSat50 and tried it between my amp and preamp. I didn't like it as well as my Black Cat Silverstar 88. I'm using a Black Cat Silverstar 88 between my dac and preamp as well. They are the best that I've tried in my system.
Last night, I ordered a Graham Slee AgSat90 cable for grins. It adds a silver conductor and supposedly a bit of additional detail. For $200, I figure it's worth a shot.