Which DAC from this list sounds best with my system: Atoll, Micromega, PS Audio, Simaudio?

I currently own a Cambridge DacMagic (original) and I'm using it with a Sonos Connect Network Streamer. the rest of my system consists of a Roksan Kandy MkIII integrated amp and Vandersteen 2C speakers. All cabling (RCA & Speaker) is Mogami.

I'm using the Digital-Out (Coax) from the Sonos to the DacMagic. Then from there to the Roksan. I like the sound of the DacMagic, but I'm looking for something that has a little more impact or slam (dynamics), as well as better bass definition and response. Perhaps something a little fuller in the mids too. 

Here are the DAC's I am curious about/considering:
1. Atoll DAC-100
2. Micromega MyDAC
3. PS Audio Digital Link III
4. Simaudio 100D