I'm planning to use the nas server mostly for storage and to host atleast two apps.
Immich like a mentioned before and homeassistent when it comes available.
I'm currently running homeassistent on a raspberry pi with a ssd.
My budget is around the 500 euros, but is not the maximum. If newer components are worth it 750 is also possible.
My home network speed is 1 GB/s.
I currently have 1 TB of storage files, i think 8 TB of storage will be enough.
I'd like to be able to use jellyfin or plex in the future, but not right away.
The case should not be too large, I prefer a case that is laying flat (don't know the case type 🙈).
Power efficiency is important.