Please don't waste your money on Nordost power cords at that price level you will not hear any difference, Nordost begins at Vahalla 2 and through the Odin line which is not in the same price range. I have personally demo'd every Nordost cable on my system.
Also I agree with a lot of the others if you can the best way is to borrow them from a an authorized audio store and hear them yourself on your system, listening to them in stores is a waste. You need to hear it yourself on your system not components that are not yours, in rooms that are not yours.
Good luck if you find the right cable power cords can make a huge difference but you must find the right cable.