Woo-hooo Michele! You're going to love it!
You really don't want to have it any bigger, Amanda. The size of the Kindle screen is perfect. I'd say it's about the size of a paperback book page, maybe slightly bigger. I think the new, larger-size Kindles will be cumbersome, but for those who really like reading newspapers and magazines, it will be good for them, and for student textbooks. This will be incredible for students. I don't know how many textbooks are available in the Kindle format yet, but can you imagine? Sure, you may have to pay $400 for the device, but you don't have to lug around all of those textbooks! And the textbooks themselves should also be cheaper.
Anyway, Amanda, if you're an avid reader, then you need a Kindle. It is pricey, but so, so worth it!