The Denafrips Ares II DAC is an excellent starter DAC and a huge improvement over the internal Node DAC. Make sure to feed it via a good USB cable.....like a Supra USB cable, great for the money.....the Supra 2.0 USB sounds very good for about $51, and the Supra Excalibur is teriffic at $140 (both on eBay, but buy from from Zendada who is the official importer for the USA
Upgrade Internal DAC of Node or go with Atoll ST120.
Looking at upgrading to a external DAC for my Bluesound Node or picking up a all in one streamer/dac like the Atoll MS120 or ST200 or another brand all together. My price for all in one would be around $1500 and DAC only would be $1000. I stream via Qobuz. Big question would be what option between these two would sound best.