Nas/HTPC 785G PSU Requirements ?

[truckid]

I am looking to build an always on Nas server, mainly to run PS3 Media Server and Squeezebox. It may be used an HTPC in the future, but for now its mostly for hosting video/audio files.

Because it will always be on, I am looking for a system with low energy consumption. I plan to buy the following components :


AMD 240e CPU
MSI 785GM-E51
4 Gigs RAM
Coolermaster 341 Elite
SAMSUNG 1TB F3 Eco HDD ( already have HDD)

In the future I'd like to add another 2 or 3 eco 3.5" HDDs.

The only thing I am missing is a PSU. I have no idea on how much electricty the system would consume on average/peak and therefore not sure how big a PSU I should get. Apart fromn the extra HDDs I dont anticpate adding anything else.

Any advice would be appreicated

Thanks