My budget is $750 (not including shipping as I am going to pick up the parts). I'm using it to stream and play games/draw. I just want medium quality on games, but not low. As you can see I require several parts including the OS.
With this build, you can get ultra settings at comfortable frame rates. It also has an excellent upgrade path. Whenever you get the cash, you can throw an i5 3570k in your build and have the option to overclock from the start. You won't have to worry about upgrading other components. Of course, you'll have to add in an aftermarket cooler if you do overclock in the future.
If you have any questions, don't hesitate to ask. I hope this helps; good luck!