memo,
I got the KK266-R, before I really knew what the reviews said, etc. So far I'm glad I did. This forum is full of ASUS users. No problem with that, and it means good support right here. There's a KK266 support site going up here: <A HREF="http://fullon3d.com/kk266faq/kk266faq.shtml" target="_new">http://fullon3d.com/kk266faq/kk266faq.shtml</A> that you might want to visit to see what help you might get for the Iwill.
I like my KK266, and it appears it will be very upgradable and O/C-able if I get into that.
I think you may want to look at features and board layout too. The Iwill is more of a KT7 clone than anything. The onboard audio is actually useful, but not quite SB Live 5.1 quality (and consumes a bit more processor too). If you want RAID, I think RAID 0 is standard on the A7V133. You've got to get the KK266-R version to get it on the Iwill. But if you do, it'll do RAID 0, 1 and both (w/4 drives). Iwill's having some minor BIOS issues that will hopefully disappear soon. There's also a "turbo bios" that gives you much fuller memory control than the std. BIOS. It's suposed to make quite a difference if you've got good memory. I have yet to try it on my Crucial PC133 C2, but I plan to.
Hope this helps. Probably won't go wrong either way.
BW
the more I learn, the less I'm sure I know...