Umm, yea lemme check.
Im gonna need an atx mobo with 1 hard drive and one dvd/ cd burner thingy. a 4850 or 9800 gtx+
I am kinda a gamer, and no I probably will not be moving it too much
Im not sure bout the size of the cpu fan or video card
Your components make this fairly easy. You don't have a mile long list of components and peripherals. You'll be fine with a mid-tower case. The CoolerMaster 690 and the Antec 900 you listed in your original post will both work for you. Both of them are very good cases. All you have to do is decide which one you prefer.
Well now, your post is a perfect example of personal preferences. Everybody has their own specific requirements, personal preferences, and opinions. Luckily there are hundreds of cases to choose from. There's something for everyone.