If you're looking for a DAC with multiple RCA coax inputs, the options collapse into only a handful, at least based on my search, within a reasonable price range. I don't care much for the optical input. I had a limited budget so I went with a Cambridge Audio DACmagic Plus. I'm feeding my CDP and Node2 into it and the sound quality is quite good. Bryston BDA models all have two coax inputs and depending on your budget you can go new or used.
Music Streamer Quality
This may be a dumb question but does the quality of a music streamer ultimately affect the sound? So here's some detail. I currently have a Sonos music streamer fed into a Simaudio Moon 300D dac. In the interest of having higher quality sound I could upgrade the dac or I could buy a dac with streaming capability such as the Simaudio 280D. I'm looking at a R2R ladder dac but would have the same Sonos feeding it. Does that make more sense than something like the Moon device? I appreciate an comments.