Well I don't have an iPhone but I have and iPod and I love my iFrogz case. They have lots of colors and it has protected it through years of travel. I just throw it in my purse or backpack and go with no worries. http://ifrogz.com/
There are way to many cases to name but I am using the Contour Showcase now. It's now that bad but I'll probably change it soon.. I recommend you go to ilounge.com and read some of the reviews on iPhone cases.
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