I know this is heresy to true believers, but AC cables, if good quality, are all very similar. At minimum the $300-+++ you will spend can be put to vastly better use elsewhere. I have a very expensive, revealing system and find many claims to be bunk.
Want good sound? Work on your room, setup, and source material.
-curmudgeonly yours,
G
Want good sound? Work on your room, setup, and source material.
-curmudgeonly yours,
G