Power Supply Suggestions

[Fortyseven]

Wanting to upgrade to this set-up:

EVGA 7950 GT 512MB

AMD 64 X2 5000+

Asus M2N-Sli Deluxe

Would like to know a good PSU for this set-up, and any other suggestions about the set-up as a whole please.

EDIT: This was suppose to be in General Hardware, so if some Mod could move it that would be great

 

[Fortyseven]

So the 320Mb 8800 GTS will have a better performance than the one I was looking at?