Use reviews, past performance of the company's products, and core competencies as a point of departure.
I've bought two DAC's that way and have been very happy with the results. The first was a Bel Canto DAC 2 and the one I currently own, an Audio Mirror DAC 1 Signature (modified by TRL). Using the criteria I cited above, it has proved successful for me.
I now get to spend more (of my very limited time) enjoying my 2ch audio system.
I've bought two DAC's that way and have been very happy with the results. The first was a Bel Canto DAC 2 and the one I currently own, an Audio Mirror DAC 1 Signature (modified by TRL). Using the criteria I cited above, it has proved successful for me.
I now get to spend more (of my very limited time) enjoying my 2ch audio system.