I'm guessing you are leaning to AMD over Intel??
I'm a bit shocked as I thought you'd be going Ivy Bridge and Kepler... ;)
You might want to look at pre-built systems too.
Here is one by CyberPower that is a solid deal for ~$530 shipped
AMD FX-Series FX-6100
AMD Radeon HD 6670 Video Card
1TB Hard Drive
24x DVD Burner
You can often get a pre-build system for way less than something you got to build. If you buy that and add in your 6950 and monitor you'd be below budget and save a ton of time.