Internal DAC quality vs external DAC's

The crazy part to all this is, each devise I've listed all have something I want. None with all the features I'd like, go figure.

I think that's the main challenge right now. Hopefully you find something that fits your needs.

Just remembered that I had a good experience with the Naim Uniti Atom this past weekend (though it was driving headphones from the speaker taps). I could find it on the network using BubbleUPnP as a renderer from my Android phone easily and I streamed Qobuz through it without a hitch.

Check out the Parasound Hint

Yes, another all in one with a DAC !!!

Could you please give a/some comparison to it's internal DAC...... 

My experience with a Rotel RA1570 integrated amplifier has been that I had to go to DAC's in the price range of the Denefrips Ares II or Schiit BiFrost to get better sound than the internal DAC.   I tried several $400 DACs and none of them sounded better than the Rotel's DAC using either USB or COAX interfaces.  It could be different with other integrated amplifiers.

It is important to note that better DAC's can have superior USB interfaces, filters, linear power supplies, and other features that integrated amplifiers don't have.  Those features can make a difference. 

I hope that this helps.

I haven't hear a pre amp/DAC combination (unless you regard AVRs in that category.  I am sure that there are some combo players that sound excellent.  However as others have noted DAC technology changes rapidly; amplifier tech not so much.  Personally i would want them to be seperate to be able to take advantages of these changes.