Pure, i should wait a bit with Windows Vista, it's great but not for gaming, i would advise you first to make a dual boot system and wait fro good video drivers.
There aren't even Nforce drivers, untill now you still need to use the default Vista drivers which are not optimised for your hardware.
I think if you have problem now already, lag, the problems will get worse using Vista and Race.
I still have a dual boot system with Vista Ultimate too, and from time to time when new beta drivers arrive i test them, and i still am not satisfied with the drivers untill now.