I lost my 6th gen Nano and need a new player for my iTunes library. I still might buy a Nano, but I am now leaning towards buying a used Touch. I have seen some older models back to as far as the 1st generation at some good prices. As I just will be using this for a music player, is there any downside to buying something older? Or in a positive context, is there any upside to me buying a new model? Thanks.