I have a cheap Fujitsu Futro S920 running a bunch of services here, but I noticed, that for some tasks its rather weak (and old) CPU simply can’t keep up. The lack of SATA is another weak point.

Is there any machine out there that can compete with its 5W idle power draw and offers better performance for a reasonable price?

ITX boards seem to draw often double what the Futro needs and here in Germany power is rather expensive.