Need a headphones amp/dac solution that I can stream to from my NAS

Title kina says it all. I am looking for a piece of gear that is:

A) headphone amp
B) DAC
C) can stream to from Network NAS without using any of my other components so ethernet connection
D) Will work with JRiver (my current s/w)

E) Volume remote would be nice, but not a deal killer
F) Can work with a wide range of headphone impedances

G) Good sounding, does not have to be the best as I am just getting into the headphone aspect after years of being away

 
It will need to be something that will be recognized by the software as another zone that can be streamed to.

I have found bits and pieces but as yet nothing as a single component, although I am not against multiple pieces if they have everything listed above.