If he's going AMD, he should probably go with the newer XP processors. The lower range (1500+ to 1700+) are not much more than the T-Birds they replaced, and are faster and cooler running. They all run at 266, btw.
I'd recommend a board based on the VIA KT266A chipset. It's stable, fast, and is quite overclockable. Here's a selection of 266A boards form Newegg to check out:
http://www.newegg.com/app/ViewProduc...it=motherboard
Hopefully that'll get you started. Any more questions, just ask!