Best DAC to go with Aurender N100H?

I do have a bias towards NOS DACs.
As I research this further, I come to find out that Metrum makes a streamer called the Ambre.
Has anybody out there heard the Ambre+Onyx combo??

Primaluna’s new DAC offering “sounds” like it may be right up your alley. 

I also run my Aurender (ACS10) thru an EEM DAC2 and it delivers all I could ask in terms of sound; it is the combination I was looking for.  The Aurender Conductor software provides flexibility  and the built-in TEAC drive for ripping is convenient and provides plenty of hard drive storage.

I recommend you consider the Ayre CODEX DAC.  It is excellent and its cost is $1,999.   Please see:

https://www.ayre.com/products/digital/codex/

It operates as a DAC or a Preamp/DAC.   It only has a USB and Toslink inputs.  I strongly recommend you use its balanced XLR cables to your amplifier.  It sounds much better when used with its balanced XLR connections.   

Another option might be the Schiit YGGY DAC.   I hope you are streaming Qobuz hi-res on your Aurender N100H.  Their 24-bit/96 and 24-bit/192 albums are terrific sounding.   Enjoy.  

I’m not surprised that audiotroy recommended a Lumin, he is a dealer for them. A little slanted recommendation in my opinion.
As for the comment, an aurender will sound good with any dac, bs! A source component will only sound as good as the weakest link in the chain of components. Any aurender teamed up with a $300 dac will sound like a $300 dac. There are many decent music servers out there, Lumin is a decent server. 
As for a 1 box solution, I would stay away from that. If you would have bought a 1 box solution a year ago and then wanted MQA for example, you would have to replace the whole box. If you would buy a FPGA based dac, you could get MQA probably for free. There are changes in the digital world, higher resolution formats, MQA, and who knows what’s being worked on that we don’t know about, find a good streamer (if you want to go down this path) and get a very good FPGA dac