ATI 7500 is a better value than the GF 2 MX 400 and it cost about the same price. If ya don't need onboard RAID for your motherboard, the Albatron PX845PEV Pro ($95 at newEgg.com) is just the best P4 motherboard. It includes quality LAN and audio, and great overclocking features. Pick the P4 1.8A ($141 at newEgg.com) instead of the P4 2.0. Takes about 30 seconds to overclock (strictly through the motherboards bios, increase FSB from 100MHz to 133MHz, nothing difficult) a 1.8A to 2.4GHz. Pair it with a 512MB Kingston PC2700 Memory module ($138 at newEgg.com) and you're all set.
<i>It's your world kid!!!</i>