with a cool head and some patience. to wit, check different sites for price comparisons. once you've done that, move on to check the prices for external graphics cards to see if it's not more interesting (it could be, but some people are leery of externals for laptops), then finally check to see if it wouldn't be cheaper to just buy a new laptop with all the warranties added. don't forget to establish a budget.
hope that helps.
given infinite funds and entries, what would you like to study and how high would your studies go?