Probably rather spend it on the ram.

If my old psu fails
New Computer PC 550W ATX Power Supply Silent Dual Fan - eBay Standard ATX, Power Supplies, Components, Upgrades, Computers. (end time 14-Feb-08 14:17:02 AEDST)

I have that one still in my cubboard as a spare.

Don't really need a better one, my gpu is not very demanding