I contacted the Chord Company a number of weeks ago about this, and they said that they were working on a high end BNC to mini-co-ax cable. Their only offering at the moment in this config is the Clearway, which is based on the early Sarum Digitals, according to their website. Currently I use a Chord Signature BNC to full co-ax on a Hugo. It's very good, though I would prefer a cable that is a bit more bendy, as the cable routing is a bit of a pain. Moon Audio will also make you up a Silver Dragon BNC to mini co-ax, which is very fairly priced, though I have no idea what it sounds like (and they do international shipping). The various headphone enthusiast sites rate the Moon Audio Dragons quite favourably.