I would appreciate some guidance as to what to get. Does the CPU speed and storage capacity really make a difference or will an older unit from Craigslist do as well? Aren't these just basically monitors for the P3P or am I missing something? I'm looking either at a new Air 2 or an older Air, or maybe a mini as long as it has the Retina display. I'm thinking my iPhone 6 is too small for these old eyes. Thank you