It's really not a big deal, and the more I think about it, the more I'm leaning towards the 4750. I spend a whole lot of time writing, and the 17" WSXGA resolution seems about perfect, both size-wise and for the fact that you can have two full-size documents side-by-side.
Battery life would be great, but as I get closer to actually dropping the cash the screen is becoming steadily more important. Can't wait to play some games on it; definitely seems like just about the perfect setup.
Edit: Doh! Forgot ask, how is the battery attached, does it seem like something that you could swap quickly without tools?