I would definitely put Innous products on your list of standalone Streamers. I would also put Denafrips products on your shortlist of standalone DACs. The Teac UD701N will embarrass many $5K DACs and Streamers and put a few $10K DAC/Streamers on notice!
How do you assess a DAC?
I've currently got an Audiolab M-Dac+ and am now going to add a streamer to my system, a lot of which have inbuilt DACs. I'd like to know whether the DAC in the streamers, such as the iFi NEO stream and others I'm considering, is going to be better than my Audiolab, in which case I'd spend a bit more for an "upgrade" and sell on my DAC.
Is it a matter of taste or can I compare certain specs to get an answer?