Having owned the 1012+1050 combination, and now the 2060, IMHO, Boulders are designed to such standards that cable differences are not as significant as perhaps with other gear (Probably has to do with high input impedances and low output impedances).
That said, I've had best results (most neutral and transparent "sounding") with Kharma cable (both the Grand Reference and the Enigma range).
I've had Nordost Quattro, Valhallas, Siltech G5 & G6, and Transparent Audio cables in comparison. Have not tried any others in comparison with the Kharmas though I'm curious to try Stealth Indras at some point ;)
Hope this helps.
That said, I've had best results (most neutral and transparent "sounding") with Kharma cable (both the Grand Reference and the Enigma range).
I've had Nordost Quattro, Valhallas, Siltech G5 & G6, and Transparent Audio cables in comparison. Have not tried any others in comparison with the Kharmas though I'm curious to try Stealth Indras at some point ;)
Hope this helps.