I have to disagree with most posters on this thread.
Get a MacBook. For a casual user, the MB is far and away the best value. I'll second what another poster said above about not being able to tell the difference in speed between a MB and MBP. Go to an Apple Store and test out the MacBook - you'll see it's plenty fast (just make sure you get at least 1 GHZ of memory). So the biggest difference will be in screen size and style. The Pros are obviously 15.2" and 17" vs. 13.3" for the MB, so the size difference is significant. Also, the metal casing on the Pros looks quite a big different the the MB's plastic casing. My preference was for both the smaller size (I prefer compactness in my laptops), and the white plastic (most distinctive color since there are already a lot of black and silver laptops out there). So for me it was MacBook all the way.