Hi Michael,

I might be more the "cautious" kind of guy, but I would recommend buying a used C2550 (or C2750) with ECC memory. I use a C2750 in a Fractal Design 304, which is on lowest fan speed very silent. The 304 is not very cheep though, but there are cheaper options. The C2750 does not produce a lot of heat (it is fan less itself) and does only need a bit of airflow in the case. Most of the time one does not need ECC memory, but just ask yourself if you can live with the possibility of loosing data or data corruption.

Best wishes,

Robert