Thinking of purchasing an iPad 3 for my birthday in September, at that point in time it would be half through its yearly life cycle. Would it still be worth purchasing? I'll be mainly using it for YouTube, Twitter, Facebook and of course MacRumors. Is there that much that then can improve from the iPad 3 to the iPad 4, that would make it worth upgrading? Or should I also hold out until the Microsoft Surface comes out? Not knowing if its going to be a fail or next iPad rival.