Hi, If looking for a good yet inexpensive USB cable for a DAC, I'd like to recommend Tripp-Lite U023-series. These are double shielded (braid & Mylar) and include ferrite chokes, A-B plugs. Paid about $13. I am using this on an auditorium PA system to connect a Radial USB-Pro to the mixing console. That DAC is a little over the $200 limit here but not by a lot and I think the sound is beyond all expectations. Comparing the tripp-Lite with a discontinued BNIB LH Labs Lightspeed 1G, the tripp-lite wins hands down for it's clear, rich, open, dynamic and expressive sound. Every sound comes through the Tripp-Lite with punch and precision while the discontinued Lightspeed really suppresses some or the instrumentation.
I am also using a Trip-Lite at home to connect my laptop to an Essence HDACC, though I haven't gone out of my way to compare this with boutique cables.
I don't do on the move DAC applications which is what the Dragonfly is built for. I have an iBasso DX 80 that. Horses for courses as they say.
Ken