I unloaded my iPad 3 on CL and noticed the iPad 4 and 1st gen minis dropping in price drastically. I can't decide whether to get a new Retina mini or a new Air. What is the best bang for the buck? I'm leaning towards a used iPad 4 and Retina mini because then I'll have both iPads in Retina. I only use my iPad for Internet and Netflix and reading.