AMD Athlon XP 2800+
Gigabyte GA-7N400
1024MB DDR PC2700
ATi Radeon 9600SE 128MB
Sound Blaster Audigy 2 Platinum
it runs about 40-60fps at 800x600, medium settings. how much impact would it make to upgrade to a 9800Pro or XT? or what could i swap out to get the best performance increase...