I won't do a big, detailed review here, but I wanted to make more folks aware of the Keces product line, as I don't see much ink about them. I have the DA-152, which is a USB DAC + headphone amp. The USB DAC, to my ears, clearly outperformed the on board DACs on KingRex T20U and Glow Audio Amp One, as well as the magiDAC from Audiomagus. Headphone amp is great as well.
The 152 sells for $475 + shipping from Taiwan. They sell a variety of items - DACs, USB and SPIDF, and headphone amps. The 152 is the most expensive, but I believe all are the same technology, just with fewer or different features. Customer service is very strong. No worries dealing with these guys. I had an issue and it was resolved quickly, and my expectations were exceeded.
Best place to check out their gear is on ebay, just search Keces.