that a standard case for atx mb that you picked out. (12 by 9.6 inches). it should fit. unless the issue is with long video cards hitting the hard drive bay on the case. on your build i drop down to a 670 there only a little slower then the 680. use the savings for 120g ssd.
Thanks for highlighting. Apparently an older attempt to post this actually went through although it said "Site temporary available". I am using a linux based machine and somehow I am having problems to post any new questions here.