I'm just about to purchase a case for my iphone case that can sustain getting wet. I know there's a lot of cases that claim to be waterproof. I'm looking for something that is small enough to carry everyday and can survive a dunk in a lake. I'm looking for firsthand reviews from someone who has used one. I've looked at Lifeproof and the Griffin Survivor. I like the Lifeproof but it costs half the price of the phone ($100) however; it is very form fitting and small. Any thoughts?