Power cord replacement suggestions

I would imagine that it would depend on the component and how much resolving power it has.

+1 droleg. 
As my mother said:
'If you have nothing nice to say, say nothing'.
But, that was a long time ago...
Bob

PS- I hope you can find a difference in sound with you new cables. I am in the process of switching out some power cords, if you like, you can try them.

Droleg, you do know that you can plug a 15amp male plug into a 20 amp female outlet without issue?

The 20 amp circuit allows more current to flow than a 15 amp before the breaker trips, hence the recommendations to use 20 amp for your stereo wiring. Things like amplifiers can have transient power demands that a 15 amp circuit might 'stifle', the 20 amp gives a little more headroom.
I am probably using the wrong terms, but I hope you get the idea.
If only Almarg were here....
Bob

There are no 'dumb' questions. We all have to learn.