I couldn't tell you about Windows 7, I've been to lazy to check the norms for Windows support, I stuck 7 in there because MOST are afraid of change. Personally I went with 8.
The case, go check it out on Newegg to be sure, they have an unboxing review and you can see inside the case. iirc; the case holds up to a 12 inch card normally, but you can remove a set of drive bays to gain a few more inches. In this way, I'm not sure I could find you a card that wouldn't fit, but I'm open to being proven wrong. Anyways, man, like I said, check it out on Newegg. It's a pretty case, I almost went for a 530 (slightly bigger version for better opportunities to upgrade to water cooling) but went for the Fractal Design Define R4 instead.