I am thinking of either getting the Gainward 1200xp Golden Sample FX5900
128mb Vivo video card, or the MSI FX5900 128mb Vivo card.

ANyone have any recommendations?

I've read the Gainward in one review could reach 498/900 speeds, and the MSI
could reach 500/1000.
Funny since the Gainward are labelled "Golden Sample" you would think they
would clock higher