You should be aware (and maybe already are) that the May DACs are not currently available new. I consider that a shame because I have a May KTE and I'm very pleased with it.
As far as interconnects, my go-to's in the past have been the Zavfino Fusions, and I still consider them to be excellent. They were, however and in my opinion, outdone by a bit of a sleeper cable, the Xangsane 4N pure silver. I also bought quite a few various knockoff AQ Dragon cables. I like all of them except for the connection between the May and the Bliss headphone amp (I'm an all-XLR guy). The knockoff Dragon's sounded smeared and a bit sloppy here so I went back to the Xangsanes and the clarity was immediately restored. I still use a knockoff Dragon XLR between my pre and power amps and it sounds much better there but I'm tempted to try a Xangsane there, too. I also really like all the other Dragons I bought (mainly power cords plus speaker cables and some HDMIs).
The suggestion to avoid silver may indeed be a valid one but the Xangsane's would allow you to see for yourself without breaking the bank ($250/1M). The reason I tried them in the first place was because of a glowing report here at AG about one of their power cables.

