Hi I have an Alienware X51 and was looking at re-casing it to allow a better graphics card to used with it, with some research, it looks like I'll stick with the 51 case, just for ease (and the fact I only have wifi, due to being in the army).
I still want to upgrade my graphics card, and preferably stay with nvidia. but I'm aware of the tight fit, so whats my best bet in 2014
alienware x51
nvidia geforce gtx 660
intel core i7-3770 cpu i7-3770 cpu @ 3.4 ghz
16gb RAM