The Marantz HD-DAC1 is a stylish compact DAC and headphone amp that comes with USB and analog 3.5mm in. Though it does not have the best specs when it comes to audio decoding capabilities, it's a great sounding device.
The Topping D10s is a compact, dedicated DAC and bridge that is highly regarded by reviewers.
24 bit / 192 kHz
32 bit / 384 kHz
Cirrus Logic CS4398
Audio Science Review