On Mid-Fi or similar, speaker cable is not as important as on true Hi-Fi equipment that can flesh out inferior cable or IC's. Then factor in Synergy to the mix. Even with that said, max out at $500.00 for your Speaker Cables (buy used) and let the well heeled spend the stupid money on the cost is no object cables.
Cables do make a difference, but there still is Audiofool overpriced cable out there....
Jim