any suggestions on what to replace Bluesound Node 2i with

@elsfan
I did the same with Pawel. Great guy and very helpful.

He steered me to the SBooster 5V/3A LPS to use with his PSU interface upgrade(which was a snap to install). I am using a modestly upgraded power cable as well.

With my Classe SSP-800 DAC the Node 2i really swings.

I upgraded from the Node to the Cambridge CXNv2 and have found it to be a solid upgrade.   I wanted to keep a simple interface across multiple services (similar to BluOS).   Also needed Spotify connect support.  Tried the Moon streamer/DAC and the Cambridge was clearly the best bang for the buck.  (Note: I also took advantage of the balanced analog outputs, so that likely played a factor as well).  

OP here. I am not just looking to replace my streamer. I am doing a major upgrade of my home theater system with a second subwoofer and a separate 3 channel amp to run LCR speakers. I am also replacing my ceiling speakers with much better ones. I am also replacing speaker wire and cables with much better wire. Adding a streamer is part of a comprehensive upgrade. 
Realistically how much of an improvement will a high end streamer make over a Bluesound Node 2i? 
I realized last night that listening to Qobuz with my Node2i was not that much better than listening to Apple Lossless through my Apple TV music app. 
If I buy the Lumin T2 it will cost about 10X what the Bluesound costs. Should I expect a huge improvement in the music for $4500 or will it be more subtle with somewhat better detail, separation of instruments a better soundstage? I am hoping that before I spend the money replacing the Bluesound I will be able to compare the Lumin to the Bluesound on my upgraded system. 

I replaced my bluesound node 2i with a Lumin D2.   Best move ever.....

@galleybob you could look for a local Lumin dealer and ask if you could bring your Node 2i over to compare, or to borrow a T2 to try at home. I'm pretty confident you will find the T2 sounds significantly better than the Node 2i. And the T2 is a huge improvement over the D2.