Project86 has posted a review of the Audinst HUD-DX1 DAC/Amp on Head-Fi.  Price point is just under $400.

Summary:

Pros: Bold, lively sound from the DAC portion, headphone amp powerful enough for planars, rock-solid stability over USB
Cons: Gain is too high for some headphones and especially IEMs, price isn’t as low as I’d like

Review of the HUD-DX1

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