I have enjoyed a PS Audio DirectStream DAC & Memory Player and a few weeks ago decided to replace the stock cable provided by PS Audio with a Wireworld Silver Starlight HDMI cable and immediately enjoyed "more musical" results. I can't explain the difference, but it does now sound "smoother", with acoustic sounds (piano, violin, voices, etc.) sounding a bit more "natural".
I have a good friend who works for NASA and tells me that the electrons travel on the outside of surface of a wire. Silver does have slightly better conductivity, compared with oxygen-free copper. So if you go with a "silver plated" or "silver clad" cable, to make sure it's high quality. All my cabling is Wireworld Silver Starlight, I find it to be great performance at their price points. I do suspect that their solid silver cabling might be better, but it's nearly triple the price of the silver clad.
