Our SFF HP came out at 150€ with flash storage and 16GB of RAM. I see used M1s for 200-250€ where we live. The only drawback of the M1 is you’d be stuck buying a NAS/DAS for the storage part, whereas the HP has 3 internal SATA ports. Neither option is silly, they have different pros/cons. Managing Linux quirks has gotten frustrating, for example.