Had chance vista 64 oem £50 but as i use lot old programs and hardware on amd 4200 would be no point as you cant gt drivers for most stuff.
Before purchase any hardware make sure it has 64 bit vista driver other wise vista 64 new security features wont allow you to install driver.
Trouble is people with 1gb and 2gb memory screwed as they way vue programmer's did memory and no 1 bloke has over 16gb memory wont tell us how much but he a gaming nutter,  money no object.
If carrara 6 does water and other effects like vue then i will drop vue as i don't see why i should pay to upgrade memory just to use vue.
With 64 vista check carefully what you want turned off as its new security features nice but has upset vista 32 bit users, as vista 32 does not have the extra security especially going on web like 64.
But glad ya having fun with new machine.