Start with Audioquest Rocket 88, they are the best bang for the buck Audioquest cable. You can usually find a nice used pair for much less than a thousand dollars.
Paying six grand for speaker cables is just ridiculous.
Help me choice Audioquest speaker cables
What Audioquest speaker cables should I choice to hook up MAC C611 amps to B&W 800d3 speakers? Will be using MAC C2700 tube preamp. My dealer suggested I USE REDWOOD cables.