A friend who has the Aurender N20 pairs it with a Furutech Nanoflux AC cable. I'm not sure if there is any additional model number to it. He loves it, chose it after trying a whole bunch of other expensive models.
I don't have an Aurender but for my Rockna WaveNet server I use a Veritas Praesto. Excellent cable and unbelievable value. I also have their less expensive Aeris which is really nice in its own way. I like it a little better with analog gear than digital though.

