Well, this may help with the pricing dispute:
Anyone note what's missing here? motherboard
, not to mention KB, mouse and speakers. I do believe that would take up a yet decent chunk of that remaining cost. However, there's still room for a few improvements, such as a better CPU cooler, more fans if need-be, etc. I also only threw in just a single one of the optical drives, just to note.
A little bit of notice: if you're doing mostly photo and video editing, get an Nvidia GPU card, especially if you're using any Adobe apps. Cuda-based acceleration of software is being found more and more, and is especially apparent in Adobe's.