Hi Alexandra,
As some members have previously mentioned...go for an IBM Thinkpad X or T.
I have an IBM T41p (p=workstation,and not needed for normal computing). Pentium M 1.7, 1G RAM, 60G HDD (7200rpp), Wireless, 6.5 hrs battery, Video ATI mobility fire GL T2 128mb, 1400 x 1050 high res screen etc. It really is great, can;t say enough about it, but just as important is the stuff that other notebooks don't have eg; 3 year wantantee, high quality manufacture/engineering, V.good tech support tel & online, the built in Thinkpad software that helps to keep everything running without missing a beat, such as the hidden backup partition that holds a copy of the original from factory os and software, plus any additional backups you want. Also, They look professional...you don't want to be seen carrying a toy around campus.
Both the X & T series are suprisingly thin and light (you will be hard pressed to find another notebook containing their config, which have the same dimensions. The X series and T series thinkpads are the business line within the IBM range, with the X being smaller and therefore lighter which may be of advatage to you.
Anyway, I'm obviously biased (my last 4 notbooks have been IBM). Good luck with the decision...I know you'l make the correct one
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Have fun at uni (what are you studying?) send me an email when you decide.