I have tried the Harmonic Tech AC 11 and I thought my stock cord sounded better, so did my friend who I lent it to. Synergistic Master Coupler could be had for about 140.00 used, they are pretty good, I own one and felt that it marginally improved the sound. The high dollar stuff unfortunatly is where the big jumps in improvment occur. If you wanted to stretch you budget a bit the Powersnakes Sidewinder are said to be great, about 260.00 retail. I don't own any of these, but I do own Viper and King Cobras and they have made a world of diffrence in my system. They are quite a bit more expensive though.
