Stay away from Nordost then, as life with Nordost begins with their Vahalla 2 series and goes up to Odin 2, however, all of those will be out of your price range even used, anything less than Vahalla 2 cables won’t make any sonic difference for you unfortunately... I don’t have any experience with any other cables, see everyone’s recommendations that own those products. What I personally found is (power cables) should be your # 1 priority , then speakers, and lastly interconnects, my interconnects made only a marginal difference maybe 3%, in hindsight I would not have spent the money for interconnect cables.
Good luck there are a lot of others responding who can help you. If you have an opportunity to demo before you buy I would highly suggest that...
Norm