Roon Power Supply

@thinman2 Since the Roon Nucleus is Roon Core only (correct me if I am wrong), you will either need a standalone Roon Endpoint/Renderer OR an "audio device" that offers Roon Endpoint/Rendering.

You will also need to decide between a networked solution or going direct into the "audio device" via HDMI or USB.

For your DAC, I suggest that overall performance and sound quality drive your choice AND NOT whether it is MQA enabled (you get the first MQA unfold via Roon, regardless).

I’ve achieved terrific performance with both: a separate Roon Renderer/Endpoint AND with that function housed internal to my DAC.

The Nucleus (or NUC running ROCK) can be connected directly via USB to a DAC. This isn't recommended by Roon for the best SQ, but if your DAC does a good job of rejecting noise from USB, or if you use some form of USB re-generator, it will work fine. 

@thinman2 - I currently have my Roon Nucleus connected via Curious USB Cable to a Chord Qutest.  I like this combination very much.  
The system with all its details can be found here:
https://systems.audiogon.com/systems/8156
All that is missing is the Sbooster Power Supply that has only been in the system for two weeks now.  I have been streaming via Tidal since 2014 and via Qobuz since November.  Personally I prefer Qobuz to Tidal.  If you do MQA, Roon will perform the first bit of unfolding, which will get you all the way to 96K; and I'd argue most of the goodness to be had is within that first 96K.  I too, wouldn't get too hung up on MQA.  The vast majority of what is out there streaming-wise is at Redbook quality.

Jaytor. Isn't that essentially what I am doing now by running the Roon to Dragon Fly red into my preamp?  I thought I could connect the Roon Nucleus vis USB to a DAC that has a USB input? And then balanced connections to my preamp. I obviously have a lot to learn. Would someone give me examples of a standalone Roon Endpoint; audio device that offers Roon Endpoint/Rendering.  I have been looking at audio note (ANK) tube DACs that have USB input but got cold feet when they wouldn't disclose the units specifications. 

@thinman2  Take a look at the Roon partners and their product offerings, as a starting point.

This will give you a great feel for component breadth and depth. There are others that are not Roon "certified / tested" that work equally well.

https://roonlabs.com/partners

I was using the Sonore Signature Rendu SE as my standalone Roon Endpoint/Renderer.