Forget those flimsy rubberized or silicon cases that you can get for $1.87 over at Amazon. If you want to protect your essential mobile partner, what you want is a case that can get go anywhere, withstand the elements, and offers shockproof protection. Here's a few cases that aren't just about their looks (but still look cool)...
Lifeproof iPhone Case What we like about this case is the size: only 13.3 mm. This could be the skinniest case available for your iPhone. Dirt, water, shock, snow... it's designed to keep them all out. You can take your device to the beach, dirt bike riding and skiing with no problem. The material selection for the case won't make it stick to your pocket making it difficult to retrieve. You can even drop it from 2 meters! But you'll pay a premium for all this protection: $69.95.
Otter Box Reflex SeriesOtter Box have been the standard for mobile device heavy duty protection. The Reflex case comes with a slick exterior and easy snap-off for docking (part of the case is required to be removed in order to being able to dock your iPhone). The single layer, dual density material makes this case ultra shock absorbent. It also comes with a self-adhering clear screen protector. This case will cost you $34.95.
Vapor iPhone Case
This is one case that truly focus on the industrial design, ergonomic shape and complements the lines of the iPhone 4. A solid CNC aluminum frame lined with a new, shock absorbent liner material is what makes this case especially adept at keeping your phone safe. The Vapor is available in several colors, priced at the top range of $79.99.