Well I played the demo back on my old computer on shall we say less than ideal framerates, and though it was pretty good. Depending on how it runs, or if it runs at all, I might just get the full thing.
Since then, it has occured to me that maybe having the newest drivers isn't such a good idea, so I've downloaded some older ones recommended by them, and we'll see how it goes. Thanks for the tip pyro, there is a patch of sorts, which helps optimize performance with the new Windows XP 64-bit, but I don't actually have Win64, only a 64-bit processor, and the patch is around 400 megs.