Hi. I have decided I want to purchase some of these to start protecting my books. I have some gorgeous ones that I love. Not for collecting and selling purposes, but just for me. I want them to stay pretty. For those of you who use them, could you tell me what I need to order? I looked at the site and got very confused. There is a pdf on how to decide, but I would like to hear opinions about the different types from you guys who have actually bought and used them. Help please?!