Without a doubt, LifeProof Cases LifeProof for iPhone 4 ($70) is one of the sleekest heavy-duty cases we have seen. Unlike other models that are clearly over-engineered, LifeProof has a more simplistic look while maintaing protection against water, dirt, snow, and shock -- at least, that's what the company claims. A two piece shell, it fits around the iPhone 4 and the edges of the halves snap together. At the bottom there's a small latch; it serves…
