I was recently confronted with the same decision to upgrade from the Node2. I too wanted a meaningful upgrade as we all know the Node 2 packs an exceptionally large amount of performance into its modest price. I also stream Tidal 95% of the time. Having a similar budget constraint I ultimately decided to go with the Auralic Vega G1. At $3799 USD it's a little above your budget but perhaps still worth considering. An excellent streamer/DAC and made a profoundly positive impact on my system. I A/B'd a bit between the Node 2 and Vega G1 and the impact to the overall dynamics and soundstage were really nice. You get a nice iOS control platform, Tidal integration, MQA, and Roon ready.
Here's a link to a recent review. http://www.the-ear.net/review-hardware/auralic-vega-g1-streamer-dac
The Node 2 has since been moved to my 2nd system in the mancave where it fits perfectly.
Here's a link to a recent review. http://www.the-ear.net/review-hardware/auralic-vega-g1-streamer-dac
The Node 2 has since been moved to my 2nd system in the mancave where it fits perfectly.