Whats the best?

All,

What is the best OS to play games with? Currently i have a 32-bit Vista, would getting Windows 7 or increase gaming by much? or is it just a better graphics card i need?

I have AMD Phenom X3
4Gig Ram
Geforce 9400GT 512mb

Cheers

BETTER GPU

the 5670 is budget conscious and good there is the always favorite 5750/70

but it depends on what resoluyionm in want to play in the end

The maximum resolution my monitor supports is 1360x768, so if i only need a Graphics card is the one you reccomended the best one for this?

5670 for 100 bucks its more than enough to play games with great quality