SoTM dcbl Cat 7 cable, chosen after reading several reviews from owners impressions and pro reviews. The improvement in sound quality over the Audio Sensibility modified Supra cat 8 cable is obvious, but yes in agreement with what you have surmised, and as ghdprentice reported, the difference is perhaps a 2/10 given that a power cable difference is 9/10.
Check out Audio Bacon's review of a few of them; I agree with his findings comparing the Supra to the SoTM.