975x rev 304+
Be carefull as some supplier still have revision 303 and you'll need to mod it in order to run Conroe.
Also apparently some new Rev305 are starting to float around.
Best idea is to wait for Nf5,new Ati's chipset and intel 965. Especially if you dont need CorssFire, and you want SLi/ single card. These motherboards should be release pretty soon!