I would say a solid 650W PSU is enough to run your configuration, however, if you plan to do extensive overclocking I'd go with a 750W for extra headroom. This is a good Antec PSU made by Seasonic. It will run your system no problem. It also has some extra room if you want to beef up your system later down the road. It's 80 Plus Gold and a new model. This would be my personal replacement if my old PCP&C ever took a dive.