which should i get? the differnce in price isnt an issue. im going to use it as my only computer in college next year, my dad is concerned the the 15 is too big and wont fit well on the little desks in lecture halls. but i think the 12 is too small and im not a fan of the smaller res. i like the lighted keyboard on the 15". for my use, email, typing papers, internet and ocassionally editing video (basic college student things) which should get?