I think you should find the Gigabyte GA-5SMM just as good at 133 MHZ. I have found it to be rock stable at 133 providing the on board cache is disabled and running with a PCI video card. It has overclocking settings at 105, 112, 124/31,124/41, and 133/33. I have not tried the 133 settings with onboard video.
Discussion relating to Socket 7 hardware.