My best result has been the DHC symbiote fusion, which is a silver/copper hybrid. Seems to maximize the full frequency range. Silver also sounds great, just decided to try the hybrid since I assumed they were tuned and distributed with an spc cable. I went custom mostly to get a 5 ft. cable, plus I'm not crazy about memory wire.
Personally I am using a DHC Fusion V1 6 Core as it's a cable that will provide an overall sound improvement instead to just one particular area of the sound. Since Kozato has his own unit now, I can borrow his demo unit on days he isn't open hehehe.
I have a friend using the K10 who feels that SPC and K10 are a better pairing as SPC can help him to increase bass while keeping the other areas relatively unchanged or providing them with some small improvements. Right now he's using an Effect Audio Thor SPC 8core that I lent him. Brannan may know who I'm referring to, my friend and him are ok pretty good terms:)