I just got a similar machine yesterday. My previous notebook was an iBook, and I'll be the first to say this thing is pretty nice. I opted for the 1.66 Duo, 100gb HDD, and one 9 cell battery. Build quality is just fine, and so far it runs cool. I didn't get a Macbook because I was afraid of the...
I don't want to run into the "dual core gaming issue" problems some dual core nvidia users are having, so ....
X2 3800 and an ati x1800xl
3700+ San Diego and an nvidia 7800gt
What route would you take?
I don't know about improvement, but there is a mighty big thread over at nvidia's forums complaining about dual core problems with nforce dual core enabled drivers: