Well... From your link, it appears Onkyo and Denon do Tidal Connect, but I am unsure which models or even where to begin as they have not been in my wheelhouse for ages.
My next choice would be the Bluesound Powernode for $899 (yes, it is above your $800 mark and is only an 80wpc NAD amp):
https://www.bluesound.com/products/powernode/
Possibly the Sonos amp? 125wpc at $649:
https://www.sonos.com/en-us/shop/amp.html
I guess it depends on what platform you would like to invest in. I prefer Blue OS (running Roon). I do not have any experience with Sonos or Heos (Denon).
There are a lot of options out there for an all-in-one; unfortunately, it seems the prices just go up!