If overclocking is your game then go for the 1ghz TBird AXIA chip especially the 'y' series but be prepared to pay a little extra, they are very overclockable especially when coupled with the thermoengine heatsink and I havent seen one that hasnt hit 1.5ghz
As for Mobo's the IWILL is a very good board as it is stable at very high FSB speeds but for speed i would choose the Abit KT7A-R but there are a few compatabilitty issues especially with GF2 graphics cards, I too would stick with a via chipset. DDR DRAM is also an option.
At the moment I am running the 1ghz chip at 1.7ghz this is at a FSB speed of 155 this runs stable but i do not recommend it unless you are willing to invest in water cooling
regards
matt
[ 07-10-2001: Message edited by: delirious_lyrics ]