To me it seems like it'll be the king of the hill for awhile... the nforce board or the new sis chipsets don't seem hold up.
Which SiS chipset. The 735? That's nearly 5 months old. And anyway, SiS is going to be coming out with a SiS 745 chipset in Q1 next year. So who knows.
As for nForce, it has easily proven to be every bit as fast as any of the KT266A boards (Epox, Shuttle, MSI, etc.). However, I'd wait until we see a nForce retail board tested out by the usual suspects (Anand, Tom, etc.) before we conclude anything that definitive.