With my M30's I used Cardas Neutral Reference and updated the "stock" jumpers with Audioquest pure silver jumpers. As the M30's are relatively neutral speakers (and a bit forward) this seemed to work nicely.
I never made to the Golden Reference with my M30's, but that was my next logical step. I am currently using Verastarr Silver Signature with my Verity's and a tubed amp. I really like the theses cables.