At the top of the case, with the vertical grate in the back above the IO ports... what's the story on size there? I've got the case sitting on my desk here at school with the side panel off, and judging by eye, a 120mm fan won't fit there. 2x 92mm maybe? Could help get stale air out the top.
EDIT: 2x80mm would fit there nice with a little cutting. If you look at the top of the case, there are some rail type things that hang down that would need to be trimmed in the back, but 2x80mm would definately fit.