just to show yall that building it really isn't as cheap as yall front, look here
http://pcpartpicker.com/p/82Vf
the only thing different is the power supply, so theoretically i would have saved a ~$100-$150 at best
Although it takes advantages of deals, it doesn't list them all. I got an Athlon II X4 for about $30 (3.0GHz), which is DEAD CHEAP new thanks to some Microcenter shenanigans.
On the plus side of cost savings, you'll also get building knowledge and experience.