+1, Bricasti M3 DAC: My Ayre Codex DAC was excellent but the unit was getting old and I wanted to try something else. At that time Bricasti, just announced their M3 DAC. After several phone calls with my retailer, and Bricasti, I purchased the M3 DAC in January 2020. It took time for the M3 to break in BUT it was light years BETTER than the Ayre Codex DAC. I like the Bricasti M3 DAC very much and highly recommend you consider it. The addition of the Bricasti M3 DAC substantially improved the sound quality of my audio system.
Based on my positive experience with Bricasti, I encourage you to consider the M3 DAC. Bricasti is a USA Company located in Shirley, MA. Their customer service is excellent.
I also looked at the MSB Discrete DAC but everything thing was an extra cost option (USB, AES/EBU, power supply, etc.,) and expensive. The dCS Bartok was also interesting but, based on my research, I kept coming back to Bricasti. The Chord DAVE was also on my list, but I decided to pass (my Chord retailer was very 'pushy' and not helpful). I hope this helps. Any more questions?
I am not familiar with the Holo Audio May and the PS Audio DS. BTW, I use the Bricasti M21 DAC in my other audio system.