I need a laptop for school (i'm in 10th grade) and i need advice whether to buy the macbook, macbook pro 2.26 or macbook pro 2.53. I want the cheapest one to suit my needs. I will mainly be doing word processing, internet browsing and watching videos, etc. I wont be doing video editing or photoshop or anything like that. Also, weight is an issue, because i will be carrying it to school everyday. Which one is best for me? thanks in advance.