Ditto, I was fortunate enough recently to be given a new gfx card and it's improved the game experience considerably without sacrificing fps, but it's still AGP, and although there is still some scope for upgrades, I think I'm better off not spending too much more on it, it's not as if it'll be worth anything.
Oh, one thing to bear in mind, although I'm sure you know this already. Even if you're switching to Vista (urgh) the 64-bit versions are the only ones which would be able to use 4Gb, I think the 32-bit versions can't use more than 3 - 3.5Gb?
~S~ Jabo