Node 2i use with external DAC

+1, soix.  
Separates for flexibility and much higher gains in SQ vs. one box streamer/DAC component. 

You know, I recommend that you just enjoy your 2i for a couple of months before getting antsy and start spending the long bucks.

Yes, the 2i sells so well because of its satisfying sound quality at a reasonable price, but I bet that over a 1,000 2is sell for each one of the high cost units. The others are not going anywhere, just enjoy for awhile what you have and then make a decision.

@jetter - there's something to be said for that. It's a damn good product for the money, and you have to spend considerably more to better it by a noticeable amount. 

the 2i will benefit from a better DAC, but is still ultimately limited as a source, so I wouldn't spend big money on a DAC...maybe a Bifrost or Gungnir, or Denafrips Ares ll

I think I'll plan on investing in a higher end DAC knowing that I'll replace the Node2i with a better source in the future.  It will be "good" for now but will slowly upgrade as I go along.  

This discussion has been extremely helpful.  Thanks to all for sharing their experience/knowledge.