My wife is taking online classes and so far at least one course per term has had an ebook rather than a traditional paper text. The issue is that it's a bit difficult to read the text on the iPad 2 screen, or there is a lot of zooming in. She and I have no issues with the power of the 2, just the screen. So I'm wondering if it makes sense to pick up a refurb 3 or if I should go ahead and get the 4 (or see if she can wait until the 5). What does everyone think? I like the idea of the 3 since it's cheaper, but I also don't want to be too stuck behind the times.