I would save some money and try the AntiCables Level 3 power cord first, especially with the trial period. At $330 for 5ft the Level 3 significantly outperformed several cables in the $660-$1100 range in my system. They really took care of power line noise, too. I read about them on the San Francisco Audiophile Society webpage. They did a blind shootout, and the AntiCables came in 2nd against some pretty pricey competition.
Just my 2 cents.
Scott