There are to many good cables to suggest just a few. So I will just go with an unknown oddball brand that can sound as good as $2000 to $3000 cables for $100 to $200 used.
TImeportal is a copper silver wire. The heavy speaker cables were $2000 but can be found for $200, interconnects were $1000 but sell for $100 to $200, power cables were $1000 to $2000 now sell $150 to $200. Problem is they are not easy to sell, but they sound really good even for there retail price.
I know it’s a odd ball suggestion just thought I would throw it out there. They are more like buying a better component than just buying wire to make things sound a little better.
They have really good bass and dig deep for information. I preferred them to my Acoustic Zen silver reference and some other more expensive cables. The Timeportals were more natural much better bass but could dig as deep for info and detail as AZ.
They also sold under VALABS and King Cables back in the day. I still have some in the closet but will keep them there good enough to keep around. If I was on a budget or not I would check them out.