defiance is right sling...
creamo, exile, and i just upgraded with the latest chipsets on our motherboards.
I have the Epox 8KHA+ (266A chipset), creamo and exile went for the SOYO DRAGON, as it has a few more options than what i was going to use (IDE RAID, Etc etc) but still has the 266A chipset (which is VIAs latest DDR chipset).
Get some good ram, pc2100, at least 512 megs, or go pc2400 if you want to get into overclocking.
As far as chips go, get a XP 1800, or wait a few weeks and the 1900 will go down i'm sure.