Don't buy - Rent or Lease. Especially if its only for Uni. and personal stuff.
Laptops are old news by the time you get them out of the shop.
Leasing allows you to claim a certain amount back on your income tax (if any) and usually includes some sort of free-service clause.
I haven't bought one in years and reckon I'm about $1500 ahead because of it.
Mind you, I probably just spent it on booze and fags!