The Abit KG7 would definitely be my first choice. It's not quite out yet.
Second would be the Asus A7M266.
Third...well, just get one of those, you'll be happy
Anyhow, they both use the AMD 761, which is the currently best performing DDR chipset around, and both companies are very good. Only two companies I'd buy a motherboard from, although I'd be satisfied using motherboards from a few other companies in a pinch (Iwill, Tyan, MSI).
Hope that helps. The only review I know of for the KG7 can be found <A HREF="http://www.hardocp.com/reviews/mainboards/abit/kg7/" target="_new">here</A>.
Reviews for the A7M266 are plentiful, check them out <A HREF="http://www.xbitlabs.com/mainboards/asus-a7m266.html" target="_new">here</A> and <A HREF="http://www.planetamd.com/a7m266a_1.shtml" target="_new">here</A>.
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