DAC suggestions?

As others have suggested, I would remove the Mac from the system and go for separates for the DAC and streamer.  Some have suggested an Innuos streamer, and I have a Stream 1 with Phoenix USB output on order, although your budget says go with one of the older used Innuous models.  For the DAC, last year I upgraded my Schiit Bifrost 2/64 (now in my office at home where I do use my Mac Mini M4Pro) to the Gungnir 2,  and I am exceptionally pleased with the sound quality I am getting from my system—Rogue RP-7 preamp, Odyssey monobloc amps, Fyne F702 speakers with two Rythmik Subs, with 4’ Silversmith Fidelium speaker cables and a mix of AudioQuest and Morrow interconnects and Ice Age Audio power cables.

2.3 Doge 7 MkII tube DAC              

2.6 Ferrum Wandla - HR competes w 10k DACs 

     +1.2 HYPSOS power supply 

2.7 LAiV Harmony DAC

3.0 Musician Aquarius - sounds like a $5k DAC

4.0 Linear Tube Audio Aero DAC

4.3   Denafrips Terminator  [BNC in, 

     XLR out](But USB in best per AudioBacon)                                                                                      

The NuPrime Evolution DAC-2 - that hardly anybody around seem to know (or care?) about/have experience with - is an excellent D/A-converter/preamp. When fully run-in (and it easily needs 200-300 hours to settle in, sounding closed-in and "woolen" between ~75-135 hours in particular) I found it to be the better DAC compared to a fully updated 2018 Bricasti M1 and comparing overall equally to a Weiss DAC-1 MkIII. It's that good (and for the price, ~$3.5k, it's close to a downright steal). 

"Better" to some is different to others, but the resolving capabilities, transparency, analogue imprinting and dynamic prowess of the NuPrime are unquestionably better than the Bricasti, and the former by no means is a details-first presenter. The Weiss in particular has a midrange to die for, but arguably it's also ever so slightly too pronounced compared to the NuPrime (system/speaker dependent?), that to my ears has a more balanced, getting-out-of-the-way approach and better low end to boot. Make no mistake though, the Weiss is a great DAC.

I'll echo @kennyc who mentioned the Musician Audio Aquarius. Amazing deal for what you get. I guess they have a lot in common with Denafrips, maybe the same designer or factory? Either way, that DAC is seriously impressive in my opinion.

Save your $$. For $2700, the LAIV Harmony could be a $10,000 DAC if they charged at this price. It sings melodiously and is a beautiful piece of industrial design. Look it up. Neal