Here's one I just put together for $748. It even has an optical drive to install your OS.
I actually have it on a usb drive but that would save me even more. (before looking at build)
Well, I didn't include a 3rd party CPU cooler, so you wouldn't be able to overclock the CPU safely until you dropped $30 or so on one (Hyper Evo 212 is what a lot of us go with.) But that part can always be added at any time in the future, and isn't really a requirement.