I went a bit more then a couple hundred, but if you buy some parts used, you can probably get something close to this. It’s super quiet, very low energy use, just works up there on the cabinet in my home office.

Edit: the case is a bit bigger, not exactly sff, but still small enough. The important thing is that it fits 6 big drives and could fit a few more ssds (currently it has 4 + an ssd), and even more important, low power = low electricity bill, low noise = I forget about it.

It runs jelly, hosts my photography hobby, has a few play services I rarely use.