Here's what I just built for my uncle about 3 weeks ago:
Antec Solution Series Beige SLK1600 w/300 watt psu
Lite-On 52X CD-ROM
2 Enermax Adjustable 80mm fans UC-8FAB-B (I HIGHLY recommend those)
Thermaltake TR2TT HSF (adjustable)
Sony 3.5" floppy
WD400JB 7200 RPM 8MB cache hard drive
Asus A7N8X-X mobo
AthlonXP 2000+
Sapphire Radeon 9200SE (Do NOT use the included catalyst drivers, go for newer version)
2 sticks 256MB Kingston ValueRAM PC3200
It's rock solid (so far) and is as silent as a brand new Dell (I outdid myself this time)
Sorry, I didn't save any benchmarks to show & tell, but I'll say, it's absolutely NO DOG.
Grand total was about $480 including delivery.
Hope that helps you. It turned out to be a spitting image of what Anandtech recommended in the last budget guide.