Creative Sound blaster E5 - Headphone amp + USB DAC with OTG + Toslink + aptX + recording + more.
CS4398 is still among the best DAC Cirrus Logic made, and still compared well with TOTL DAC from other DAC maker. TPA6120A2 is actually quite common, which you can find it on Sony PHA-1 and Fostex HP-P1. As I mentioned, the problem with TPA6120A2 is ......