I want to buy mini 2 16 or 32Gb but I m confused that if I will buy this one n later I sell than its gonna be really old edition .or should I buy ipad mini 4 16Gb or ipad air 2 16Gb wifi n cellular.plzzz help me .this one is my first apple device .n in 16GB how much photos n apps roughly we can install? I want to buy in 4-5 days so plzz who is having gud thoughts abut it or having gud experience tell me.all suggestions r respected .n one more thing that I can afford only these models .mainly I want to buy for reading purpose.