Upgrade over Sonos ZP90?

Hi there fellow a-goners.
I am in the process of upgrading my system. I use my faithful Sonos as a digital source and have been perfectly happy with it up-to-date. However, I understand that there are better digital transports out there. What I need is a transport that would be as user-friendly as the Sonos, but will exceeded in terms of sound quality and have the ability to do high res. I intend to use it as a transport with an external DAC and my DAC does not have USB input, so it’s either coaxial or Optical inputs (I have a Reimyo DAP-777 and a CHORD DAC64).

I was looking at aurender, auralic Aries, and Linn Akurate DS1.
I also have an Oppo 105D i use it strictly for video, as my experience with it as an audio  transport has not been good: Sonos sounds better.
I am a cost minding type of guy, so I am looking for a used piece preferably under 2000 us. Thanks for your help and looking forward to your advice.