E-reader

As an avid reader, I really want to get an e-reader in order to save on shelf space, etc.  I, however, as a person who will go back to school in the future and will (hopefully) do some publishing, have a big concern.  I want to be able to cite books in papers, but can't do so if I can't see the correct page number.

For example, on the Barnes and Noble site about the Nook, it has in the FAQ section the question, "Why do my NOOK page numbers not match up with the page numbers of my physical book?"  The answer is, "You may notice that sometimes when you turn pages, the page number doesn't change. Since the screen on the NOOK can contain fewer words than a physical page of a book (depending on the font size being used), sometimes it will take several screens of text to display an entire page. In these cases, the page number will not change, although you are making progress through the book."  That's not really an answer to the question.  The answer deals with why one physical page might be several e-pages, but it doesn't say if the page numbers in the NOOK match up with physical page numbers.  The Kindle site does not say anything about how the page numbers match up.

Does anyone who has an e-reader have any insight on this?  Or, does anyone know if Turabian or other citation guides have new guidelines on how to cite books from an e-reader?