hi there – do you want to transport this around everywhere? or is it to stay at home whilst you take pen and paper to lectures. portability?
Are you doing anything which will involve a lot of computer power (spreadsheets, simulations, modelling etc.)
I bought a big (19″) and heavy ACER in 2005 for my Uni work and its still working. If you have your student card you can buy software on the cheap… office etc. so something to think about.
I now lecture and see more and more tablets in the lecture room. All our lectures are in electronic format and its quite a clever idea – but writing essays on a tablet could be painful (storage also???).
Good luck! and read as many reviews as possible.
Ps if you are a mature student can you ask the Uni/college if you can get funding towards a laptop?