Hello guys, I'm a PC noob and I'm having trouble locating a suitable cooler. The diameter of the fan is 80mm and as you can see there isn't any more room. I'm having trouble locating a suitable cooler for it and I was wondering if you people could direct me in the right way. The computer is a Dell XPS8500 and the processor is an Intel i7-3770.
Link to image: http://imageshack.us/a/img36/4522/9oq2.jpg

Link to image: http://imageshack.us/a/img36/4522/9oq2.jpg