So Many Choices - PCords for Digital Sources?

I know there are many threads on Power Cords and how to choose them. I am trying to make the best decision on replacing the stock PC's on 3 of my digital sources. They include:

Oppo BDP 83 Blu Ray Player
Arcam DV 139 Multi Player
Benchmark DAC 1

Here are the factors most important to me in the decision:

Cost - Good value for quality on PC ($100-250 range)

Quality - PC will make my equipment better sounding, lower noise floor on digital equipment, quality made

Sound Improvement - PC that will improve the overall sound of my system

Other equipment in my system includes the following:

ATI 3007 7 Channel Amp - 300W
Integra DTC 9.9 Processor
Usher BE 718 Monitors - Front & Rears
Usher BE Center Channel
60" Pioneer Elite Plasma

All plugged into a PS Audio Power Plant Premier Conditioner
Dedicated 20 Amp Circuit for electronics and Video only

Any Suggestions on Power Cords based on my criteria above? My goal is to have a great sounding system at a reasonable price. No $1,000 PC's on a $599 dollar player.

Thanks,

Toddsgear