holy crap are you serious? that's not even close to worth it in my eyes, you will see little if any improvement in your games, in fact you may lose performance. and for that 8700gt, come on even if it does perform better than a 7900gs it won't be worth the amount of money that it would cost to buy a laptop with that card. i think you should either hold out until nvidia's next-gen mobile cards come out (g9x) or use the money on a desktop gaming computer and keep your current laptop.