Don't do it! Cases are a scam!
It is a scam, for those who think it protects the glass screen from shattering. And its not naked or case. It is encased or normal.
Why would you add weight and bulk to a device that Apple spent much effort to get as light and thin as possible?
I think the whole case thing came about only because of antenna gate when Apple gave out the free bumpers. Did most people really use cases on iphone 1s and 2s? Now people feel or think they MUST have a case -- cause they see other people doing it. I think people buy a case now and don't even think about it, and whether it is really necessary.