Need help in deciding what to upgrade

I built my computer from parts the summer of 2000 and I want to play some of the newer games and it is starting to run slow so I am considering an upgrade. Right now I have a P3 600e overclocked to 800mHz, 128mb PC133 RAM, Sound Blaster Live, Maxtor 30gb 7200rpm drive, and a Geforce 2 MX Video Card. I like the Athlon XP Processors and have thought of getting the XP1600 with the AGOIA cores and overclock it. I am having a problem on deciding on what type of board I want; KT333, KT400, or NForce 2 (when it comes out and how much it is). I don't want to spend a fortune on the upgrade so what type of board should I get to have a stable XP1600 running at a pretty fast overclock. I also need some new memory and a Video Card. I was thinking about 512mb of Corsair XMS PC2700 RAM; if there is a cheaper and more sensible solution please inform me, Video Cards I was thinking about 128mb TI4200 but I don't know if thats the best or wait for Radeon 9700 pros or something else to come out soon. If anyone could just please give me some input on what all I should look at getting I would greatly appreciate it. Thanks again in advance!!