Wow Jon, your system looks special! First question, did you notice a difference with BNC input on that setup vs. CD transport, if tried it?
And that PC/SoTM USB card looks interesting, but darn I don’t think it would work with my laptop. For your gold DXIO box, I’ve just read it may be comparable to the SU-1 but can’t be certain yet. But then what’s the concept behind the desire to get rid of a few of the cables?
And which RCA cables are you using? It looks like they’re dual per channel. I was thinking to make a DIY RCA cable from this material, per a tip from an experienced Head-Fi’er.
Also I noticed from your adjacent photos you’re using a THX SMSL amp. Check this link for a very special tube amp called Oblivion and Citadel from Ultrasonic Studios. Another user has a similar looking THX 788 amp and he is amazed by the performance of the Ultrasonic amp.