For those that have separate Streamers & DACS

@badgerdms System is Fleetwood Deville's, Backert Labs Rhythm 1.3 and McGary SA1E

that sounds a lot like Dr.Vinyl’s old system…he had that same setup last year

Several of the audiophiles I know with the long experience run fanless NUCs with separate LPS. The DAC associated in one system is a Holo May.

So, the Bricasti M5 is a player/renderer and lacks support for streaming services like Tidal or Qobuz.  It needs a server to pair with it to work.  This can be a computer, Roon Nucleus or a myriad of other servers.  
 

The Antipodes S30 will serve as a server and player.  It is not my first choice for that duty.  It is good as a Roon server assuming you aren’t running any DSD files but is best when paired with a player like the M5.  
 

if you were to opt for the Bricasti M3, best option is to get the network card.  It is a $1000 upgrade and is literally the same card that is in the M5.  That with a Nucleus, Nucleus+ Or Antipodes S30 or S40 (Nucleus + or S40 is necessary for DSD) will be your best performing options.  The M3 with network card from an S30 would be VERY nice.  
 

I believe the Merason and Ideon don’t have player options.  Assuming the same $4k cap, I would look at a Roon Nucleus with an M5.  This is a better combo than you would think and I know will outperform the S30 on its own.  
 

For what it is worth , I am currently using a Roon Nucleus with Bricasti M5 as Roon endpoint in my main rig, and can very much vouch for it.  Real happy with the M5 since acquiring it back in March of this year.  Considerable jump up in sound quality vs using Roon Nucleus as a server/streamer.  Best streamer solution I have used in my room.  Other solutions have included Bluesound Node N100 (the original cube), Node 2i, and Melco N1A.  Current DAC (since 2019) has been Chord Qutest.  Prior to that DAC was Bryston BDA1.