I am set on getting a Burson unit. This is the dilemma.
I have a ASUS Xonar Essence ST which I think is a pretty great DAC/Soundcard for the price (thinking about also switching the OP-AMPS with the Burson versions).
I also use Earsonics SM3 V1 (soon to have V2 as well) plus RE0 as a backup.
So ... I see two paths.
Burson HD160 amp only using the Xonar as the DAC using RCA outs.
Burson HD160D Dac/Amp combo unit.