I'm probably excessively interested in Raspberry Pi audio. There are a bunch of streaming solutions available. Moode Audio and LMS are my favorites. MPD and Mopidy require a bit of command line knowledge and hands on setup but are highly flexible. Moode comes with Camilla DSP. LMS is easiest to set up. There are a large number of DAC HATS available, some of which have been measured here. The Pi 4 can be used with USB output. Actually all Pis can but on earlier models USB and ethernet share a bus. Another option for direct output is HDMI. I have a Pi connected to my AVR this way.
If you use streaming services Moode supports lossless streaming as does Volumio. I prefer Moode because it's totally free and open source. It also provides a huge variety of geeky tweaking. In the last few years Volumio has adopted a freemium model and the free version has been losing features.
The thing I like about the Pi solution is that it's easy to put together something for $100 that's pretty good, especially if you use a transport HAT with optical/coax outs. You can go as low as $15 with a Pi Zero W with HDMI output. Built in analogue audio is not very good. For under $200 you can exceed the limits of human hearing without a problem.
I use my Pis for DLNA/SMB files on a NAS mostly. I don't use any streaming services although I do listen to internet radio. There are a variety of front ends for Pi software. Some have a browser based UI and there are mobile apps as well. There is a Window$ app for LMS. You have to be a bit geeky to use a Pi. There is no appliance solution. Everything available requires some hands on configuration although Moode, Volumio, and LMS don't require doing anything on the command line. MPD requires a lot more work.
The Pi shortage is beginning to ease. Rpilocator,
https://rpilocator.com/, provides daily information on availability. It's still harder in the US but if you keep an eye on it you can find Pi 4s at list price. Pi Zeros are becoming common.