One nice thing about the Nook George gave me, which is also a terrible thing about it, is the instant gratification of obtaining new books -- less expensive in electronic form, but more expensive than secondhand. Another disadvantage is the impossibility of passing a book along to a friend. I know, I know -- you can lend one to someone who also has a Nook, but...it's limited as to time, and it's just not the same.
As opposed to the Kindle, I think the Nook might be the most fortunate choice for me because it operates off a touch screen and there are no physical buttons to break. Also, I understand some libraries now lend electronic books to the Nook. Something to look into.
I LOVE my Nook.
Works that have passed into public domain are available easily -- sometimes free or "The Complete Works of So-and-So" for a buck ninety-eight.
I found "Beautiful Joe" -- from my childhood. I read it and reread it as a girl. Finding it again was a joy. I enjoyed it just as much as an adult. I learned that my childhood book had been edited, probably for length (little Billy joined a circus -- who knew?) I hadn't known that Marshall Saunders was a woman and Canadian, that there was a real Beautiful Joe, that the book won a contest sponsored by a humane society, and that there is a sequel. Even though to my contemporary sensibilities it's preachy (in the same way Louisa May Alcott is) I love it still.