I've been using the 47 Labs Shigaraki series 4715 DAC and 4716 transport for the past five years and find them to be very satisfying for digital playback. I haven't heard the Reference series Flatfish transport or Progression or Gemini DAC's or the other manufacturer's units you mention so I can't make a comparison.
NOS DAC's such as the 47 Labs are worth checking out to see if they are a good fit for your digital playback standards as they offer a different presentation than that of upsampling digital gear.
NOS DAC's such as the 47 Labs are worth checking out to see if they are a good fit for your digital playback standards as they offer a different presentation than that of upsampling digital gear.