You should try to demo before you buy. I just demoed over a three week period a shunyata diamondback and a ps audio perfect wave ac10 on my Plinius 9200 integrated and my Naim cd5i-2. All i can say is, both these cords did nothing for my system. Maybe they needed more break in time but, i could not keep them any longer, i had to return them to my dealer. I am not saying power cords don't do anything, it's finding the right one.
Which power cord more important?
I'm thinking of changing my stock power cords for my cd player and 100 wpc integrated for better ones...however, I might have enough just to change one of them for now....am I right assuming that the power cord for amplifier will make a bigger difference than the one for the cd player?