im currently looking at antec 902 or 1200 . my gpu will be a hd 5850 . ( if that will fit in the 902 ill get the 902 ) but anyway name me some good cases that fit ATX mainboards and are rather long enough to fit the 5850. send me a link on newegg if can that would be much very helpful
If you're just looking for a good case that'l fit the 5850, then even the Antec 300 will do the job pretty well (it will even fit a gtx 295 comfortably).
Obviously, the 1200 (being a full tower) will also do the job. So if you have the resources, by all means, get that one. Otherwise even a 300 will be good enough for you.