I like to use Otterbox Defender with the plastic screen protector off(I pop it out, then clean up glue residue). I work in a warehouse all day and have yet to even scratch a screen using this method (4 different iPhones now). I personally don't like the "air gap" created by those types of screen protectors that are built into cases. Lifeproof has the Nuud, but it's such a low profile protector, it doesn't really prevent things from hitting the screen.