I used an Elrod Statement on my DNA-500 with excellent results. Its best to try several - maybe call the Cable Company(John is helpful) and get a few to try from them. Good luck.
When I had my DNA500 I tried a bunch of different cords. The one that I preferred the most was the Purist Audio Dominus (Ferox). It seemed to be nice compromise between a Shunyata Python Alpha and my Elrod EPS Signature 3.
Another cord I would suggest you try is the new Tek-Line Reference cord. I prefer this cord to the Dominus and if you don't like it you can send it back.
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