Have you heard LTA Aero, Lab12 Reference, Denafrips Pontus 15th?

Yes, I do not need MQA or DSD. I2s is not needed too.  

I prefer not to combine the DAC and preamp--so I'm not tied to each in one. 

LTA looks to have great service. That's great to hear firsthand too. 

Using a Lab 12 Dac 1 Reference for 2 years the new LTA Aero Dac was at the top of my upgrade list. After doing some research and following the “Six DAC Comparison” thread’s reviews I decided to pick up a used Mojo Mystique Evo B4B 21 Dac thinking it was low risk at $3000 (Msrp $9000+). I really liked the Lab 12 Tube DAC but this DAC is at another level. I am partial to tubes and the Mojo has that life-like live concert natural sound like tubes. Mojo DACs are excellent and I would consider adding them to your list.

Interesting @tksteingraber .  I will check it out nonetheless now. 

If you are looking in the $4K range, suggest checking out the Holo Audio May DAC.  Cost $4,200+ new depending on the build you choose.  End game for some.