Best Otterbox case for my IPhone?

I'm buying an IPhone 4s from AT&T and am wondering what case to get with it. I have heard great things about the Otterbox, but when I look on Amazon, I see a ton of different kinds. What are the differences between the Defender, the Commuter, the Impact and the Reflex Otterbox cases? I know the Defender is supposed to have good protection but have heard its bulky. I want something that isn't slippery because I'm kind of clumsy and also want something that will hold up when dropped and protect the phone well and preferably, something that'd fit in a pocket. The pocket thing isn't an absolute must, though. But I definitely need something that isn't slippery and easy to drop and something that won't break apart and will protect the phone if I do accidentally drop it. And something that looks cute/nice would be good, too. One last thing, are the Otterboxes really all they're cracked up to be, or do other cases basically do the same thing?

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2. This Otterbox Defender is AMAZING. I have no words to express how I feel right now. My husband has the iPhone 4 with one of these cases on it and just tonight ran it over with his drive axle on his semi tow truck (13, 000 pounds) and the phone has NO damage mechanically or visually. The only thing that happened was the plastic screen on the otterbox came off. But that can be glued back on. I LOVE these cases and they really do make the phone virtually indestructible. I will recommend this case to anyone I know of till I'm blue in the face.