Granny,
First thanks for keeping this a civil discussion of opinions unlike others that have chimed in on this thread.
I took a look at your earlier posts and reviews and it appears that you favor tubed equipment where in some cases the power supply caps are the only "regulation" in the power supply, and I'll agree that capacitors can sound different in this case.
In my own designs which are all solid state with heavy regulation in the power supplies - just like the original poster's case with the Krell Amplifier - I sincerely doubt that there will be any sonic difference if similar spec capacitors from two different manufactures are used.
As far as power cords are concerned I have not experienced much difference as long as the cords are of proper gauge and are terminated with quality connectors, and before spending serious $ on power cords I'd make sure that whats in front of the cord is taken care of first. Dedicated lines, etc. In most cases this will cost less than many of the high $ power cords and it will have a much greater positive effect than the last 5 feet of wire feeding the equipment.
As always, Good listening
Peter