I believe the purpose of supercars like Ferrari existing is multifold. First and foremost of course, they provide a driving experience like no other. Of course due to the cost of owning (and maintaining!) a Ferrari this is a very exclusive experience. I believe there is another, even greater experience, for the existence of Ferrari, however. That is the joy of seeing (and hearing) one drive by and to give one something to daydream about. In short, the existence of Ferrari is about inspiration.
Which Ferrari would you pick from the five above? Having seen them in person, I would go with the yellow F430 Spider.