I think someone's treading into the best worn pathway in HiFi forum life here...
Thought 1. Properly specified OFC stranded, well made with carefully connected plugs and with a jacket that protects from any interference (a simple matter if one understands the science) is all you need. It costs somewhere about £5 a meter and is widely available. You can pay more for nice colours, or, for very long runs, a bit more thickness if you want.
Thought 2. There's more to science than we know and sometimes, a cable maker's new ideas produce a cable that passes the pure signal from the cable above, 'better'. For some, this is clearly audible and if you can't hear these changes, then you are daft.
Two other things occur to me.
The Placebo effect, likely to be responsible for 99.9% of the claims in thought 2, also has a reverse side. IF you can be persuaded to believe a non-existent change (which, as medicine proves, you can) then there must also exist the oither side of that coin. One can persuade oneself NOT to hear any changes there may be, persuading oneself that such things cannot exist.
There's no accounting for taste.
Cable threads summary.
Spend what you want, as long as you know that the above may well be true.