In my opinion, if it's saving you>$1000 go for the MacBook.
The CPU's are identical "Memron" Core 2 Duo's except for clock speed. Even there the difference is only 170MHz. Certainly not worth $1000. When it comes to performance, this is negligible. Remember, this is a Dual-Core CPU.
RAM and HDD are identical.
Superdrive, 8 > 6, but I think that's a typo anyway (SD's used to be 6x but are now 8x, I believe).
Screen, 13" may seem a little small, but is the extra 2" worth $1000 when you could (I'm assuming you'll have something like a desk) put up a 19" widescreen LCD for much less with the $15 mini-DVI to VGA/DVI adapter from apple?
256MB GFX vs. Whatever Standard Stuff Apple Throws In - You have your 360 to play games on. You don't want those nasty things distracting you from your school work do you
Basically, I boils down to is the following equation correct?
$1000 = 2" + GFX Card + 170MHz