I think the OP was saying he had planned on using a 635. EDIT: Guess I was wrong. Do you have parts that you have already bought that you want to use? Do you need a monitor or anything?
Honestly, I'd go with batuchka's build (the deal on that GPU & PSU is insane), and if you need to buy Windows 7 as well, just get an Athlon II X3 435 or 440. The savings on that should just about cover the $99 for Win7 64-bit OEM.
If you could post in the format linked in my sig (I hope), that might help.
Yeah I figured somebody would tell me to get rid of the PSU. It just looked really cheap. I might crossfire eventually but im not sure. As for an OS, I dont need one. That build is more then I want to spend, and it will just take longer for me to obtain the money. But if its worth it, I can wait.
There are usually some excellent bargains to be had in the 'back-to-school' sales of late summer. Keep that in mind.
In a budget build like this the sales, rebates and combo deals usually mean it's best to wait till you're about a week out. What you have right now on you list probably won't be the best options later.