Any Ethernet cable is "audiophile grade" because they all simply transmit ones and zeros. The ones that claim to do that better are either lying or uneducated.
Audio Grade Ethernet Cable
I've been thinking about getting a DH Labs ethernet cable. My thought is to get my crappy router as close to my Bryston BDP 3 as possible, so that the cable is only 0.5 meters. I do have a TeraDak LPS connected to the router. Is this a waste of time and money? I know the cable is just a couple hundred dollars but I don't want to spend that much just to realize again that my local files will always be preferable.