Oooh, let me take this one! Spend the extra $300 and get the MacBook. I was exactly where you were three weeks ago, and when you stand there and compare them side by side it's no contest. Go online and look at what you get with a "White" vs MacBook. I spent about six months doing nothing but thinking about what I was going to do. I would go in the Apple store and just stand there playing around with the demos. By the time I was ready to buy I was on a mission.
I can't emphasize how much I love this laptop.
(We won't even discuss my new found love for my iPod and iTunes.)