What case protects an iphone best from dropping?

I'm getting an iPhone 3GS for christmas because my phone is so beaten up from me dropping it. I've only had it a year and it's already really shabby looking; I've probably dropped it about 100 times. Since the iPhone costs sooo much to replace if it cracks or shatters when it gets dropped, what would be best to buy to protect it?|||otterbox!! they are amazing!