I am not sure what you mean by good...for some it means big others small or quiet or not so quiet...
So long as the case fits your PSU, Mobo, and GPU and has at least air intake from the front and back, you will be ok.
What you end up picking depends on what the whole of the system looks like. Some part pick run hotter than other...For example a gtx 480 ran so hot that you would have have to have a case that had plenty of fans to get that heat out. The new 290x runs hot too and would force you to pick a case with more fan options imo...
If you are looking to build a rig, give us a price range and what you want to do with it...