I don't know about the Marantz you mentioned, but you might want to think about what's important to you. What do you want access to, what type of user interface do you want, will the device be supported for the next xx years, do you want a display - and if so, how big?
I've been looking around at what to replace my "old" Squeezebox devices with. Been looking for at least two years, and I still can't seem to find anything that doesn't add complexity. Seems as if the vast majority of people who do stream, are not all that interested in sound quality, or interested in using anything but their phones, and some half baked free app loaded with adds.
In my case, I want a device that does not require a separate display to see the device menu functions and album art, and it needs to be large enough to see without too much trouble. It should also have a simple remote, or touch-capable. It needs to have access to numerous streaming services (not all do), and I also want access to my FLAC files stored on a network drive. Then there is the software needed to play my music files.....some media players just, well.... suck.
I wish Logitech would have stayed in the game. The Squeezebox devices were simple, easy to use, and worked reasonably well.
Sounds like you want Roon. It will turn your existing Ipad\Iphone\Android\PC into a streamer with all the album art you like, plus compatible with Quobuz and Tidal, Plus Network Shares or USB and most importantly is bit perfect. What goes in goes out.
Roon is software that needs a hardware device to render the playback.
Cheapest option is a chromecast Audio with the DAC of your choice. Use the mini optical SPDIF out on the chromecast.
Roon is 10$ a month or 699$ lifetime. Chromecast Audio is discontinued but they are on ebay. A topping D10 was used in the ASR tests and achieved impressive results of. Pretty dang cheap and impressive setup.
