My personal perference is for Wadia (& this might be biased as I'm a Wadia owner). I've heard the dCS upsampler + DAC + Clock unit (which was connected to a dedicated music computer). While the sound was very good (there were a few things not right but my belief was/is that the computer was to blame for that & not dCS) I personally felt that the Wadia made better music with better sound. Of course, IMHO. YMMV. FWIW.
Your GNSC modified unit is no longer serviceable by Wadia & Steve is the person to go to if you have any issues.
Your GNSC modified unit is no longer serviceable by Wadia & Steve is the person to go to if you have any issues.