I run a 7900 GS PCI-X: I can play both SH III (GWX 3) and SH IV without major hickups. If you can find one: it is good value and shouldn't set you back too much....
No major mods installed in GWX so far; I do do have a skin from Steed installed (VIIc1942 it is gorgeous) and the lifeboats and debris mod......
I will gave the 16 km atmospere mod a look one of these days; it gets rave reviews!
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Daddy cool 
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