check out Cullen cables, have them in my system with great results.
Auditioned two Cabledyne 12AWG silver cables. Kept one, returned the other. Listened long term to the first one on pretty much every component. Ended up coiling it up, tossing it into the surplus cable box and restoring the original cables. Thin and bright to my ears and never really broke in. Maybe I'll put some add'l hours on it in the future and see what happens.
IMHO, if you're looking to replace stock power cords and you don't want to spend a lot of cash, the Signal Cable Silver Ref will give you a relatively fluid, dynamic sound and is a decent buy for the money.