Recommended PSU for my build

Paryphodrome

Honorable
Jul 3, 2013
7
0
10,510
What PSU would you recommend for the following build?

Intel i3 3220
Asus P8H77 Motherboard
Invidia GeForce GTX 660
4GB DDR3 1333 RAM (will probably upgrade to 8GB in the future)

I'd really like to get away with a 500W PSU to save on cash but would like to know if I definitely need a 600W or not.