The PSU at 650W is probably a bit overkill, a 550W would do nicely, but with that build, with overclocking involved, it would most likely be a safe 'Overkill', for a dollar or two extra, you could swap to a EVGA Supernova G2 650W, but the PSU you selected is just as good, or really similar.
It depends on your comfort zone, as well as if you're thinking about SLI in the future?
I would stay with the 650W if I was you, so its not a bad choice, most likely good, especially with headroom, that is always the better choice. This PSU will stay with you for a long time, hopefully, as it is high quality and with 650W it provides enough headroom for 'Most' builds.
Edit: Even if you was to get a 550W PSU, you'd be saving about $10? So for the extra $10 you may as well get a 65W PSU.