I recently(ish) built a new home server using an cheap AM5 motherboard from ASUS that supports ECC. Good performance and power usage is around 45 W idle with a couple of SSDs and a couple of HDDs spinning.

Not the cheapest, but I wanted to keep power consumption low for noise and reduced heating while still having good performance if needed.

I also considered a motherboard with IPMI on AM5(Asrock rack), but that was much more expensive.

Worked out quite nicely.