That's ok, whenever you can :).
My friend has a kill-a-watt too, but I still haven't finished with the case mod to accommodate the 6 drives to plug the whole system in, so we can measure it.
I bought one of these for my 6x NAS server that I'm building in the Lian LI Q07 (some modding).
Have you measured any wattage usage for the motherboard?