I just added the Ridge Street Poiema USB cable. The only cable I had not yet upgraded was the usb. So in an effort to get the most out of my system, I picked up the Ridge Street cable. I figured if the improvement wasn't worth the investment, I'd return it within their trial period. After a few days in my system, the improvements are significant and I am not planning on sending it back. BTW, my wife also noticed significant improvements. The improvements she described were consistent with what I was hearing as well. In my system, I can only say that the Ridge Street cable made quite a noticeable improvement. There definitely is a difference between usb cables. Well, at least between the generic usb cable I was using and the Ridge Street cable. I can not say if there is any difference with the Kimber, Belkin, or other cables. I am happy with the Ridge Street cable. You might want to give it a try and if you're not happy with it, simply send it back.
Robert