Yeah... these days if you have anything under 2GHz you should probably upgrade. Yes the major needs some serious upgrading. lol
I would say before you upgrade you vid card get an AMD Athlon XP 2500 to 3000, and get 512 MB of RAM.
THEN if you wanted the best card xotix is right on.
My PC Specs
1024 MB RAM PC-3200
GeForce FX 5700 128 MB
80 Gig 7200 RPM Hard Drive
56k Modem (OH YEAH!!)
8 Channel Onboard Sound
5.1 Logitech Surround Sound
KDS Xtreme Flat Screen Monitor 17in.
Logitech Cordless Mouse
Running my long awated watercooling. Double radiator setup. 3 120mm fans right now. Finishing case.....