Curious to know your streaming and dac set up and the best recommended streamer under $15k

Curious to know your streaming and dac set up as well your best recommended streamer. I have recently upgraded my dac and have used 2 different set ups in an attempt to find the my best combination.  Former set up was Roon Nucleus+ connected to a Lumin T2. New set up is a new Nagra Tube Dac and a separate Power Supply and I had that directly connected to my Roon via Shunyata Sigma USB cable and using a Shunyata Ethernet connection to my network. Didn’t feel like that was my best possible sound so introduced the Lumin T2 back into the fold as my streamer and then connected the Nagra to the Lumin T2. This was a much improved sound. At this early testing point I’m curious to see if anyone uses and/or recommends a streamer that has significantly improved their sound under $15k. I would like to stay with the Roon platform. 

Current set up is Audio Research Ref160S amp, Audio Research Ref6SE pre-amp with Wilson Alexia speakers.  All cabling between these components is Transparent Reference. 

Unfortunately, I have not had time to photograph and upload my new Nagra dac. 

I really appreciate anyone who takes time to assist with some thoughtful ideas, experiences, or recommendations. 

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@designsfx I may not be missing anything and appreciate your point. Reason I ask the question is since I upgraded to the Nagra Dac and have experimented with different set ups the sound has really changed.  So, far running the Lumin T2 as the streamer into the Nagra sounds the best.  I wanted to see other ways people have set up their systems to see if I am missing something.  I originally had my Nagra dac plugged directly into the Roon but have since found that by reintroducing the T2 as a streamer in front of the dac my sound improved.  I'm looking to learn from someone like you what their experiences have been since I have only been in the streaming dac phase about 2 years.

Whomever suggested the analog "place" in Minnesota can go to the head of the class.....

I demoed the MSB Reference with the Innuous for about 3 months while I was deciding which way to go

So, let me get this straight, a DAC costing ~ $55,000 did not do it for you? Wow!

If you like LUMIN, but plan to use one as a streamer only (no DAC), then I believe the U1x is their top of the line: