Upgrade Video or CPU/MB/Ram

I have been playing Halo PC and would like to improve my gaming experience.

My current rig:
AthlonXP 1700+
Via KT333 chipset
512MB of PC2700
GeForce3 Ti200

My question is this: which do you think would make a greater increase in performance, video card upgrade or CPU/MB/Memory? I can't do all at once.
Here's what I had in mind:
GF FX5700 (~$200)
-or-
Athlon XP 2500+ (Barton 333Mhz)
512 mb PC3200
Motherboard (~$325)

What do you think is the weakest link in my current system for playing Halo PC? If I upgrade just the video card will it make a substantial difference?

Thanks



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Definatly graphics card.

I would buy Radeon 9600 PRO 128 MB instead of FX5700 Ultra. It's nearly equal fast and costs much less

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I.ve been playing halo with a 9600 pro. All settings to max quality. It's awsome.

Are you serious?

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<b><A HREF="http://geocities.com/spitfire_x86/myrig.html" target="_new">My Rig & 3DMark score</A></b>