Depends on what you want out of it.
Do you have any ebooks yet? If so, where do you usually get them?
Do you anticipate checking out library ebooks?
Do you want to customize the way books are shown? Change fonts, sizes, line spacing, etc. lots of other stuff...
Do you want a frontlight, for reading at night? Or are you OK without a light?
There are all kinds of different considerations to take into account, which may give us a better idea of what device is the right fit for you.
