Unfortunately, it depends. The cables you want are going to complement your system and move it in a direction that is positive for you. Which depends on your values in sound… as well as your system taken as a whole.
Finding these typically requires trying them out. Cardas are a tad warm and enhance most systems. Transparent are that. DHLabs has really good budget cables. The Cable company allows you to rent different kinds to try them.
Half price is typical for used.
Trying several kinds is probably most important.