I was in the same boat last winter and I jumped on the imaginary band waggon and bought a cheap $200 Blackberry Playbook that I thought was all the rage. I'm happy that I bought a tablet as it fits my reading demands quite nicely. The physical size isn't too large, like an Ipad. It's small enough I can carry it in my sweater pockets. Now that being said, don't get a playbook. The app scene is like a soviet warehouse: empty. I have yet to find a PDF reader that can do the same functions as my PDF reader on my Nexus S. So I'd bet on the Nexus 7 tablet. Good size, cheap at $200, and can do more than just read books if you ever feel the need to do more on a tablet. It can also leverage the whole Android market. I can say it will be my next tablet.