What GPU and do you intend on SLI/CF? Do you intend on OCing your CPU/GPU? If yes, then how high? What is your budget? A good quality 500W PSU will handle almost any single GPU system that you can buy, even with mild-moderate OCing.
Stay away from Winpower...they're cheap for a reason.
my budget is 60 £, i will be oc the cpu from 3.6 to 3.9ghz, the gpu will be a single one and i will not oc it...
so a corsair 500w can handle everything? because from some psu calculators the recomended is a 550-600w...(with the gpu)
i didint buy the 650 yet)