I had an appointment at the genius bar this past weekend and had my 3GS swapped out. There was a hairline crack on the back near the charging port. My limited one year warranty expires on 6/15/2010. I plan on giving my 3GS to my wife as soon as I get the iPhone 4. Should I purchase the AppleCare Protection Plan to extend my coverage for another year? I have to decide before 6/15/2010, so not much time. Pros? Cons?