I would suggest Acoustic Zen either Satori or Hologram speaker cables and their Reference MkII ICs. Matrix would be warmer, but Silver ref has better resolution without being bright and without loss of bass. Between the source and pre the one to use is Silver ref and Matrix ref would go between the pre and amp.
Great Copper Cables?
I have a VTL IT-85 (Mullards) with some Thiels and I get some minor excessive brightness....... I'm using PAD Museaus but one time I hooked up my backup bottom scale Audioquests and I lost some resolution but the tone warmed up nicely............ Any way just wondering who makes some of the best copper cables and which models?