Which Macbook model should I buy for university?

I'm planning on buying a new laptop for university. I'm stuck on which of the Apple products I should buy - Macbook, Macbook Pro, Macbook Air?

- Graphic design isn't too important to me
- It must be fast!
- Lots of storage space

However, after reading some other answers, I'm starting to contemplate whether a Mac would even be worth it, or should I just stick with a normal PC laptop? If so, any good PC laptop suggestions?