First off...no offence to anyone but.....
I have Cardas Golden Reference XLR .5m(source) and 1.5m(amp) with the old Van Dammn 9 gauge(speaker) and Wywires PC's.
I have tried Van Damn XLR(to bright),Nordost red dawn RCA(wayyyy to bright),Straightwire Mastro XLR(good bang for the buck),Wywires(all were good but $$),Naggy's(all were fine on 5.1 analog but brittle),CGR does make a nice sound but $$$,and some Virtual Dynamic reference speaker cables(they were the worst cables to work with and the sound was nothing special for the $$)