The DAC+amps I currently own now are the Fiio E17K and E07K, some lower-end audio interfaces for recording, and a cheap generic outboard USB based upon the CM108. The Apogee Groove sounds significantly better than them all. The Apogee Groove also has the least amount of bells and whistles out of them all. Granted the Groove retails for almost twice the price of all the other ones I've listed. However, Fiio E07K is meant to dock with the Fiio E09K - this combo price brings it closer to the Groove pricewise. The Fiio E17K will dock with Fiio's...