I am not sure if I would worry about upgrading a power cord, while still in the receiver phase of HT/audio, just because while it does make a difference, you aren't really at the reference level or even close, and so I would question whether it was audible.
You could always try one, and hear that way, but I got retentive one time and tried cords all the way into the 600 for 1.5 meter and found that I had allot of trouble hearing that being any better then a nitch brand that was nly 25 bucks, in fact nobody I had listen could hear it. The guy who makes this cord, makes very nice speaker cables, and mono block amps for 10k a pair, and his speaker cables were at 2 levels, with a 4 meter of his cheaper one's being 425 and his better being 750, they outperformedn anything else that was under 1200 bucks, and I tried 10 types between in my home. His speaker cables were also the smallest in diameter of all I tried whcih my wife liked, so when I looked for power cables and this guy that makes everything else high end, but very well for his cost point had only a 25 buck power cord, I asked the manager to ask him why? He said that was because beyond what would cost 25 bucks to sell retail , he said there was nothing else that you could do to make your power better given you still came out of the same crappy wall, and street you did, and after hearing his amps and speaker cables, that was enough for me.
The guy is named Mr Brown, and his called BEL or Brown Electronics Labratories, and if you ever get a chance to hear his speaker cables, you will buy and his amps are either 200 into 8 as a mono, with each pair hand tuned, or 50 watts by2 in stereo.