The Light Harmonic DaVinci USB DAC
The Light Harmonic DaVinci USB is perhaps the most unusual-looking DAC I've seen, with the top of the unit that can be rotated. It's a non-upsampling, non-oversampling, no-negative-feedback design, with up to 384kHz/32-bit capability. The DaVinci uses three transformers in the power supply: one for digital, one for analog, and one for USB and control. This looks like a very serious design, and the price is correspondingly serious $20,000.