6 top of the line Sony Xperia Z3 screen protectors
Shock protection aside, a screen protector is a cheap, extremely reasonable way to protect your investment. The Z3 isn't cheap, but it compensates for that by holding a high second-hand price. You know the rule - keep it in top-shape and you will be able to get back more of the money you spent on it! It goes without saying a screen protector is essential in such pursuits!