I would try and get a 4GB GTX 680. You can take down the PSU a notch to a good quality 750w, unless you plan on going dual graphics cards in the future with those 680's. And I would highly recommend an SSD instead of that Velociraptor, it's just not worth it.
A mild OC on that CPU shouldn't be a problem, just watch out when it hits in the mid 70c temperature vicinity. Then I think it would be wise to get an aftermarket cooler.