depends on what quality your expecting
obviously the higher the quality the higher the price
I'd steer clear of any intel graphics cards as they are often really crap and dont show well
the best your gonna get for affordability is an nvidia 6200 go gpu though if they still make laptops with this is beyond me, i havnt checked laptop gpus for atleast a year
i've also seen an SLI config in a 'laptop' though it was so big it can hardly be called one
there is also the Geforce go 7 series that will give you good performance
though in the end you have to decide on how much your willing to spend, how big you want it (portability), batt. life etc.
or you could get a DTP with desktop components...just dont put it on your lap