Hi there, I'm about to buy a new ipad, mainly for my son who has Down's Syndrome to support speech therapy and I'm debating on whether to splash out on the latest model with retina screen and faster A6 chip or ipad 2. What do you think? We'll probably need to buy a kid proof protector like the griffin defender and I'm guessing the benefits of the high res screen may be lost. This is a BIG purchase for us so I really want to make the right choice, any advise would be greatly appreciated. Thanks!