Threshold S/500 II power cord suggestions?

Thanks for all the responses.
Thorman I'm troubled by a kind of ghosting,ringing unwanted harmonic that it is especially noticiable right smack in the middle of the treble region. This amps seems to be very sensitive to cable connections and such.
Viridian, I will look into VenHaus and Menier, thanks.
David, lest anyone get the wrong idea, the note book I'm keying this on was made in China. I was once burnt on some investments I made in Canada. Since then I prefer to do businees with companies that have a legal presence in the USA.

Its really subtle. Perhaps my choice of words is too strong. Most noticable on female voice where the singer just gets past normal voice to extend into that stronger but oh so feminine fequency and by some of the sharper high notes on piano. In both case there is a touch of this glare, a tiny bit of brightness. One really has to listen to hear it elsewhere. Extreme high freqeuncies like cymbals and triangles are beautifully delicate and shimmering. The bass is extended, powerfull, rich and tight. The midrange is natural with no undue chestiness. Soundstage is wide, high and deep. Performers have space all around. Other than the one issue I've mentioned everything seemlessly integrates. If I can fix this sublte issue, I'll be very happy indeed. By moving some things away from the amps, tightening everything from drivers on baffles and RCA's on interconnects and components, to dressing the power cord, its all but dissappeard. The amp has recently been gone over by Jon Soderberg, so I have good reason to believe its behaving as it should. This amp doesn't like to be shut off either! The amp is a good case for the problems inherent in double blind "shoot outs". It takes time for it to warm up and be its best, even after just a brief rest.