You don't need screen protector. If you put one on you screen will look like crap, might as well not have retina display and go back to 1st gen iphone. People that scratch the screen are idiots who don't know how to take care of gadgets.
This arrogant jerk will have a scratch within a week... haha j/k bro.
Anyway, as for me I will apply the best skins ever i ordered for $8, and as soon as it gives me problems or peels up on the sides, or looks worse then a few scratches, THEN I will try to go naked screen. I have a iFrogz lean case on too.