Also on a continuation from my post above
All those outterbox's cases with the built in screen protectors, to date I have not seen one in use (lets say more than a week or two) where there was no crud, dust, etc. behind the screen protector (that could, I stress could) get a grain of sand or something in, that could scratch the screen (just my opinion, and that is all on that).
Now onto the other rugged cases, I have the rugged case with clip (and spare battery built in) for my iPhone 4s now from Seidio.
And my option post above is a better one, cause the belt clip on the Seidio or other brand I would imagine the same, sticks out a lot and could rip/ tear a seat or other object it accidentally touches, and my arm from hitting it. Is it a big problem absolutely not, but just saying and the cost on these from these major companies is $40+ more, just saying I've been down this road before.
Now for screen protection I have tried a few and always come back to zagg, just make sure when applying, I do it in the bathroom with the shower running and exhaust fan on, a lot less dust particles to apply any screen protector, use lots of liquid for the zagg and wet your fingers and keep them wet (with the zagg spray) until you start the squeegee process, keep a towel near by so when squeegeeing the extra water you can soak it up quickly before it gets into the phone, and take your time.