So I bought a used 3GS on ebay. The phone arrived with a hairline crack that the seller had not mentioned in the ad! Long story short, I got the seller to knock off $40 and then called apple who agreed to replace the unit. So I ended up with a new 32GB iPhone 3GS for only $290. Which brings me to the question: Should I get a case? I know people drop the phones catastrophically all the time, but I heard that these phones, especially with the plastic back cover, are designed to be dropped and survive. For all you owners out there: if you had to do it over, would you still go for the case?