Transport for Scott Nixon Tubedac+

I just received my Scott Nixon TubeDac + with 3XAC power transformer. I'm looking for transport direction and/or suggestions. I now have an Apogee Wideye (.5 meter) run from my Marantz SA8260 to the Tubedac. At my disposal I also have an older (late 80's) Nakamichi cd player4 that works flawlessly still, also a couple Toshiba dvd players, and even a Marantz DV8300. Would any of these be a good transport? What makes a good transport? Does the length of the coax digital cable make a difference?

Thanks