You want a better graphic card than that for gaming--this is equally important to the processor. The 5770 listed above is a good value. Nerf whatever you need to to make this happen.
You should be able to save some money on the PSU -- Antec is good, but there are cheaper models from other good companies. One example of a very good deal : (EDIT: I only recommend this because you are going for a budget GPU and not overclocking) http://www.tigerdirect.com/applications/SearchTools/ite...
Seasonic and Corsair have 500w models that should be cheaper than this as well.
You should also be able to save money on the ram -- you probably dont need CAS 7 on a $600 build, and this would have little effect on performance.