I am using a LAT International AC-2 power cable ~$100. It does not make a huge difference, but I did hear a little more extension in the highs and a little more control of the bass when I hooked it up about a year ago. I would recommend this cable, but would probably recommend line conditioning first if you do not already have it implemented in your system. I think you would get a much bigger difference in sound quality from a line conditioner. I'm under the assumption if you are going to spend $100 bucks on a power cable, you probably have a few hundred to spare for a good line conditioner.