Speaker cables for Ref.3a De Capo i & Cayin A-88T

Has anyone found a synergistic match ?
I am currently using Kimber flat ribbon cables bi-wired .
I am not sure of the model but they appear to be all copper .
Pricing would be @ $500 used per pair .
If I were to seek more of something , it would be some added sparkle on the top end .
Suggestions ?
Thank You