True, the more you wait, the better the prices will be. Although, we are talking about a FPS. What happens if your card isn't able to properly run Huxley?
Indeed DX10 & Vista seems attracting, although have you seen DX10 reviews?
Anandtech DX10 review
Granted those are desktop reviews, but laptop's graphic cards have always performed under desktop ones.
Here's a few older reviews:
8600 GT/GTS Follow-up Performance
DX10 for the Masses: NVIDIA 8600 and 8500 Series Launch
I have a friend who has the 7900 GO 512MB on his dell XPS laptop and so far, it's been running quite nicely. For an example, Bioshock runs perfectly (60 FPS) at maximum details on 1280x1024. Anyhow, if you're actually serious about DX10, then I'd recommend waiting for the 9k series. Although it could mean, as you said, up to 6 months.
Why are you asking about Kingston RAM? To my knowledge, they've always been a pretty decent company. Although, they used to be more dominant... All I see lately is Corsair & OCZ.
My two cents on the matter.