I'm putting together some old LGA775 Core2Duo PCs to use as slave PCs in a sim network setup. Depending on the graphics card that I use, from a more efficient GTX750 to an older power hungry GTX480 (yes I know it also depends on the amperage on the 12V rail), eXtreme Power Supply Calculator gives me the following wattage ranges for PSUs:
E8500 ~3.8GHz (OC) 348W - 590W
E8400 3GHz 318W - 560W
So I'm looking for PSUs rated 400W - 650W. Any suggestions for budget PSUs under £50?