Well, because there seems to be a rather small community of Aurender users here, I have to stand up for the N200. I upgraded from a modded Aurender X100L (with LPS) to the N200 and it was a huge step up in SQ, more than I expected. And stability, versatility and ease of use are absolutely stunning.
(For me this is the second most important criteria, after SQ, because the server is the device you interact with, not the DAC.)
And we have to take into consideration, that the Aurenders in question represent very different price levels. The N200 is more than double the price of the discontinued N100 and the N20 is again double the price of the N200. Just to put it in the right perspective.
But to add my opinion to the original question: When I recall the steps that I took on server side (Mac Mini > X100L > N200) and on DAC-side (PWD > DS MkI > Mods) I can clearly say, that similar investments on the DAC were much more audible (and beneficial) than those on the server/streamer. YMMV. I guess, MkII is the way to go.