Try the Virtual Dynamics Power 3 powercord before spending money on anything more expensive. A 6 feet cord only cost about $70 with a money back gaurantee. The drawback is that is it very heavy and may not work for light weight components. I was skeptic but I was impressed after talking to Rick Schultz about his design. I was even more impressed when the Power 3 gave my Mark Levinson 331 more transparency, dynamic contrast, better harmonic structure, lower noise floor, more air and ambience and smoother extended highs. It sounded like a layer of dirt was lifted between the music and I. Bass became cleaner, more focused, more taut and plainly "more real".
I never heard the Cardas Golden Powercord, but I suggest that you consider the Virtual Dynamics Power 3 also.
