best powercord for atma-sphere amps MA 1

Thank you for your suggestions. My question was spurred by reading "power cord shoot-out" of 22 cables available on the internet.It took the author 5 years to come to his conclusions, and I share his sentiment that powercables are very system or component dependent. At this point, my experience indicates that at least low powered tube amps appear to benefit from unshielded power cables - less veiled/smeared/restricted. In regards to choosing copper versus silver iec and wall plugs:the copper ac wall plug appears to provide a bass with more bite, whereas the silver appears to make vocals more organic and smooth. I have not hooked up my MA's yet but I want to make sure that I make an informed decision as I will select specific PC and IC preferrably based upon MA1 owners practical experience. On that note: Is there a consensus in regards to preferred IC's? Thank you once again!