Here's another one, quite simply the best DAC I've heard - ECP Audio's Walnut 5.0 DAC:
I actually built the PCB and rubbed some oil onto the wood. Dsavitsk of ECP Audio takes the credit for the rest, though: PCB design, case design, woodwork, etc. Still, building the PCB was pretty fun. It was the most challenging electronics project I've ever soldered - very rewarding.
Balanced output, high-res, high-bit, asynchronous USB - can't ask for much more.