I want an iPad for travel (movies, reading, surfing the web, checking email, games, etc.). I will use it when not traveling for reading, games, etc., too. I don't want to spend a lot, and having the latest version isn't important to me. However, I don't want one that's so old that some apps might not work, iOS can't be updated, etc. What do you recommend? Is there a good refurbished model I should look at? Or should I just keep saving up and get a new one?