I have a macbook air that I use for my work. I'd like to buy an ipad for my wife to use at home, for emaiing, facebook and checking the web etc. We would be upgrading from a mac G4 laptop. Would the original ipad work for us for a few years and apps still be available? The camera isn't important to us and I don't know if there's enough difference for me to save up more to buy the newer version.