On what ever you choose for school, I would go this way...
Mac Pro (multi-media)
I would choose Sony last, because of the prices of other Sony laptops, compared to other laptops with similar specs. Im my opinion, its a toss-up between the Lenovo and Mac Pro. Windows XP - Lenenovo. Mac OS X, Mac Pro.
Hope that this helps and good luck.
Looking for a laptop for grad school. Have narrowed it down to 3. Lenovo Thinkpad T60, Sony Vaio SZ240, and Apple Macbook Pro. Basically just want a laptop that is portable, with good battery life, and that will last me the next 4 years. Which of these 3 notebooks would I enjoy using and want to have for the next 4 years. Thanks for the help.