i think the reason why dell made the xps2 was because they dont think very highly of gamers. they think that all they care about are the aluminum plate and hte LED's and hte black stuff on the side or w/e. the 9300 is the enthusiasts laptop which is the one that a lot of people on this site get.
When you bought your xps2, you pretty muh just bought a bunch of LED's, a bigger battery, and a kickass sytem "out of the box." But i think that hte card will be available to both xps2 and 9300 owners(most likely through the xps2 parts site) with a little hacking of course. However, i think that the upgrade price will be huge so it miht not be that big of a deal anyway.
I still dont have a lappy yet. im pretty pissed they got rid of the coupons though, i was waiting for the 7800go and now there is no way i can afford one. a decked out 9300 with a 7800(if they even offer it on new systems) will be at least $2k unless they bring them back.