Why don't you get a few power cords from the cable company's lending library, it's a cheap way to try a few expensive cords and some lower cost ones and find out for yourself if there is a difference.
What difference do power cables make?
I’m considering a purchase (about $1000) that will include a power distribution box and a couple of very good cables to service my power amp and subwoofer..
For those who have upgraded power cables, how you would describe the sound quality difference in your system?
Do you feel that it was worth the additional investment?