Mac books are great but probably too pricey for what you want to be using them for - homework and online surfing.
They are super fast, easy to carry (MacBook Air), very smart and intuitive. My old Mac Book Pro lasted six years which is long in computer terms! They are the best option for people who spend all day on them, typing, reading and having a million apps and pages open at once. brilliant if you have to carry it to the office each day and back.
So its basically a hard working laptop for people who write a lot,or do design, photo editing or whatever. In these cases, you get a lot of use out of them and a lot for your money.
But, if you just want a straightforward laptop that won't get a lot of heavy usage during the day, there are many cheaper options out there.
Of course, of you have the money and budgeting isn't a problem, then even if you use it once in a blue moon, go for it!