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.
Cheers