What about a GT 710? It seems to require low power and I think it fits..Hard to say - that is a mighty small PSU. Also it is about 5 years old and I think that PSUs can get cranky as they age.
The GT440 at 65watts might work, but I think I would want to examine each component and arrive at a total energy budget first (motherboard, cpu, fans, drives, ram, attachments on USBs). Physical size is another issue - you have to measure the space and check card specs..no way around it - and remember that the GT440 can vary quite a bit from one model to another.