I have a THX 789 amp and the Grace Dac. I'm looking for the right balanced cables for my 6XX and 4XX, but I don't know what to get (size, length, terminal ends ??). I don't like what's currently available on Drop, and I don't feel like spending big bucks on this. Still, what's the point if I don't buy a quality cable with exceptional sound as well. Other than Periapt, what can anyone recommend (please tell me what size terminals I need on the cable for the headphones listed above). Thank you very much !!!