Cable performance is probably the least related to cost of all audio components. Rather than investing in very expensive speaker cables that may serve as little more than tone controls, closely scrutinize room acoustics and speaker placement. Appropriate use of diffusion and absorption, and proper speaker positioning can yield astounding improvements at little or no cost. Assess the accuracy of the source components, amplification and speakers. Wiring comes in dead last in overall effect regardless of what the cable companies would have audiophiles believe. Good luck!