I am still happy with my iPad 2, but my dad has been eyeing it and I would like a retina screen for reading my PDFs, so I will likely give my iPad 2 to my dad the next time the iPads get updating and pick up a new device for myself. Also, I would like my next tablet to have 4g, so that's another reason to update.
It will be hard for me to choose between the iPad mini and the iPad 5; I like the size of the full sized iPads for reading comics and magazines, but I really like the 8 inch screen on the iPad mini, which looks to be a great size for reading novels and would make the device much more portable. I would maybe even give my smartphone to my husband and just carry a feature phone and the iPad mini with me. I am curious as to how PDFs will look on the smaller screen, so if I do end up purchasing an iPad mini I will make sure that I test one out beforehand.