Should I get the Harry Potter eBook collection or all of the hardcovers?

I currently have all of the books in paperback, but they are old and falling apart. I would like to either buy them all in hardcover or get the ebooks. It would be nice to have the hardcover because I know I will have them forever that way, but it is really expensive. Also, the ebooks are much cheaper and when I go to college in a few years it will be much easier for me to bring my nook (which I take everywhere with me anyways) than 7 rather large books. What should I do?
It's pretty likely that I will be getting both sometime future, but I'm just thinking about what I should get now.