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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For relatively little money, you can try an Sbooster (et. al) external power supply for your T2. Installation is pretty simple, it does require you to cut one wire, IIRC.

I recently added a Lumin U2 Mini to stream to my Bricasti M3 DAC via USB, and I am delighted with the results. Hard to imagine it gets much better than this. I had previously upgraded my network with fiber and linear power supplies. My 2¢.

A couple of months ago I also upgraded my previous Hegel HD30 DAC to the Nagra Tube DAC with the Classic PSU to move into a full Nagra system. The PSU is also powering the Nagra Classic Preamp. At this point I’m only using a single Nagra Classic Amp (waiting to add the second to run them in mono in the next years). Up until this week I owned both Lumin T2 and U1. After adding the Tube DAC to the system, I made several extensive A-B comparisons between all the components I had in the streaming path. I am not doing Analog. I have a CD/SACD player (Marantz SA-1) and streamer only. During the tests, the T2 was powered either by a Farad Super3 with upgraded Farad silver DC cable or the Sbooster. All my equipment is connected to the Synergistic Galileo SX Ground Block using the High Definition SX PowerCell Ground Cables and supported by Center Stage 2M footers.
First thing I noticed with the DAC upgrade is that all the previous digital signal processing I was doing for the previous DAC became obsolete - EtherRegen, multiple Mutec re-clockers in series (all synchronized by Mutec REF10 Master Clock) and all using Transparent Reference XL power cords, XL 75-Ohm clock cables and Reference AES/EBU only degraded the sound (ambience, decay and soundstage). All that wonderful gear was removed and sold. I only kept the Synergistic Research Ethernet Switch UEF connecting the Lumin streamer(s), a Lumin L1 and TP-Link Wireless Access Point with Shunyata Omega ethernet cables.
All the above to say that after removing all the “extra” from the system, I tested both T2 and U1 feeding the Tube DAC with Transparent Reference XL BNC, Shunyata Omega AES/EBU, Omega BNC, Omega USB and Dynamique Audio Zenith 2 BNC and Apex AES/EBU.
From all the possible iterations made for almost three months, the best sound I consistently got was using the U1 connected to the Tube DAC with the Dynamique Apex AES/EBU – better than the Shunyata Omega USB. If I used the T2 with the best of my available cables (Omega BNC/USB and Omega Ethernet), it could match the U1 not using the top cables, but when using the best cables with the U1, it performs better than the T2. If I did not have both to compare directly, I would be happy to use the T2, but the U1 can go further beyond it. I do not think the X1 with USB or BNC connection to the Nagra would best the U1 using AES/EBU, but I have not tested that.

I do not use Roon. I have Tidal and Qobuz and Qobuz sounds better to me. Using the Marantz as transport feeding the Nagra also sounds better than the XLR Analog output of the SA-1 going directly to the Nagra Pre.
Hope this helps you.

@kellerjr01 Fantastic information.  Thank you reading and responding.  Sounds like with a little more tinkering I will get there.  Appreciate your time.