I have a Bryston BDA-3 DAC that I think is excellent. Had their streamer DAC, BDA-3.14 which has a raspberry pi card in it. That piece stopped streaming for whatever reason and in subsequent phone calls to Bryston they offered a brand new BDA-3. That is great customer service.
The BDA-3 is a class A DAC in a magazine which you all know of. When I asked Bryston why there is not a BDA-4 the reply was "we've been working on it, but are not satisfied it is better than the BDA-3".
Regards,
barts