AC-DC989 :
What is the best atx case for around $60
I suggest you don't get cheap cases because it's one of the most future proof parts of a pc (According to LinusTechTips)
You'll end up having to buy another case if you're not satisfied with the case or the USB port stops working (Thrust me, I currently have a $60 case, the front heatset port doesn't work).
The CM Haf 912 is a good option for a budget case though..