16GB RAM may be a bit low for the setup, as others have suggested, but I’m currently running Immich and Nextcloud and a handful of other small services (like FMD) dockerized in an 8GB Raspberry Pi 5. I’ve experienced very few issues. In my opinion, you could find a used Ryzen 3600 or even older, and 16GB will probably serve you just fine. You could save yourself a hundred bucks or more.

That said, what you’ve got here is nice and future-proof for quite a while, even if you end up going down the rabbit hole. You might eventually need another 16GB of RAM, but maybe not until after the AI bubble pops 🙂