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I was in a similar situation, a high school computer geek, and wanted a 'Book. I eventually got the 12" combo model with AirPort card, I have a superdrive in my MDD G4 at home.
If i had had the money, would have gotten a 15". The 12" is ultraportable, and gets the best batt life, and is perfect for whipping out in class and doin something for school. But your not always confined to a classroom, are you? No your not. And even if you were, you'd fall in love with the extra working space of a 15". The 17" would be a pain to lug around, but, does have lots of working space, which is a must for productive people. You could get the combo drive 15 model, and that would be 1999. You could even get an eduational discount!! That takes i think $200 off the 15" combo model. And $200 off both 12" models.
That's how I could afford to buy an AE card, but you could also use the leftover money for RAM, you need to add RAM.