Thank you for your response- very very helpful. I kind of thought Bricasti would likely be the way to go- and have been debating between an M3 and an M1 SE (assuming I could find a used one and within my budget). A straight M1 would probably be in range but then wouldn't an M3 with MDx be a somewhat better sounding DAC?
What I had not realized is that a Nucleus vs a Mac Mini would make such a difference- I simply assumed the Nucleus, while a more tailored solution, would still have the same characteristics of using a computer. Also, I thought that once a Dac with a network card was in place + using an ethernet connection then the Mac Mini (or similar) issues would be taken out of the loop (I guess I was thinking mostly of Usb "noise").
As someone posted already getting digital right is as complicated as analog. I am just starting to get up to speed all the intricacies and have quite a way to go.