hm..is the geforce2 mx400 pci better than the radeon sdr?
i have the radeon sdr for my i810 mobo. my computer is w2k, and has 256megs ram. it's gives 10 fps in the final cut scene in max payne (after he shoots down the chopper). i think i was at 1024x768, 2x Anti-Aliasing. also, serious sam second encounter is giving me 12fps at 1024x768, 2x aa. (yeah, i know ss:se isnt due out till feb 5

hehehe) amazingly though, it gives about 25 fps (barely accpetable) at 1152x864. and that's because the radeon sdr doesnt do AA above 1024x768.
my recommendation:
if you are buying a new video card to play games made in 2002, then replace the mobo with one that is agp. none of the current pci video cards will cut it. you'll be wasting your $. (there is no such thing as a radeon ddr pci.)
if you're not going to play games, then no need to upgrade.
oh, what's a soundblaster extigy??? (i'm not into sound cards.)
hope this helped.