I think $8000 for just one cable is pushing it. I'm using Stereovox Reference LSP-600C and I can't conceive that a much more expensive cable can bring more improvement. I think it will sound different, but that doesn't mean that is better in any aspect.
The Stereovox LSP-600C has an unbelievable clarity and tonal balance. I didn't think that a speaker cable could bring quietness to the sound until I had this cable in my system. It was as if I introduced a power conditioner to my system, and not a speaker cable. Music sounds eerily close to the real thing with excellent dynamic contrast.
I highly recommend to try a BURNED IN sample. In my experience, this cable takes longer than usual to burn in. Even if the cable has been used, it will take some time to settle in again if it has not seen a signal for a while. After it has settled in, the sound is simply glorious.
Best,
iSanchez