As of your initial post you were undecided on the video card being a 690 or two 680's so it would make a difference what you decide.http://www.performance-pcs.com/catalog/index.php?main_page=product_info&cPath=59_457_667_1075&products_id=34504
If you decide to go with the two 680's then you coud stay with the 360 and use this one. Tomorrow or the next day I will be putting the 240 version in the top of my HAF-X and once it's done I will be able to see if the 360 Monsta would work. The HAF-X isa very big case and if you went with two radiators I know one would fit and you may be able yo get a small one in there somewhere. Although it might to start to get tight with the pumps and resivoir and two radiators and you might end up with one outside. It's not a big deal to have the radiators outside as it frees up some space inside.