i am not post-dumping, just offering advice..
i agree with garrettpf, you'll probably get *closer* to what you're now asking by parting it out. you can probably fetch about 250-300 bucks for the psu/video card/case .. the rest is all for "last-gen" gaming and therefore isn't worth very much.
i wish you the best but i recently tried to sell a much "better" computer and was only able to get 350 for it, which actually wasn't too bad for how cheap new technology is.
good luck!