Sony is a bad choice unless you will be keeping it very well and will not be travelling with it much. It is a very fragile computer, that needs to be cared for with every sincerity.

And Dell in my belied, especially the high ended ones are only for Businessmen, you do not need these laptops, they are monstrous anyways.

Leaving you Hp Pavillion PCs, which are an excellent choice for students.

Ever dropped it?

If you drop a dell nothing happens. If you drop a Hp, you need to take it to the rapairs, if you drop a Vaio, you need to say "Sayonara"

I have used all three companies, and I am telling you from experience, if you buy a Vaio, you need to be VERY responsible.

Oh, thank you for your replies

Well, Sony is fragile, all my teachers (in my old school) have sony and their laptops are in real bad shapes. However, as DrEvil said, depends entirely on the model. My teachers use a lower model but 2 of my friends are using  higher models which are in pretty good shape.