It's good are you going to overclock? If you do you would be better off with a 620W PSU. Don't get me wrong 500W is enough for your build but the extra room is pretty much preferable.
500W is fine as even overclocked the build won't reach that, but I somewhat agree with 016ive. The corsair CX series power supplies are on the budget end of things. I recommend them in builds $600 and under. It never hurts to go with a slightly better quality unit.