My advice to you? Don't...
My personal philosophy with any expensive purchase is to get the most bang for your buck. In the realm of computers, that is not in the price segment you listed. You would get a lot more out of your system in terms of gamin performance by waiting and saving up another ~$200, or more. Not saying that a build at this point won't run games, but it will certainly not run them well. If you can up some more in a reasonable amount of time, I highly recommend doing so.
If you absolutely must buy now, here's my recommendation...http://pcpartpicker.com/parts/partlist/
Having a 6670 is better than having the on die graphics found in AMD's Llano offerings, while Intel Pentium's trade blows with some of AMD's best in games.
I want to stress again though that you would be much better off saving some money so you can upgrade the build.