[success] Sabertooth z77, i7 3770K, GTX 680, Mountain Lion
Downloaded the combo update.
I had to remove other kexts Nvidia, and other FakeSMC plugin kexts, HWmonitor also that were in the way but besides that I had copied all the kext from 10.8.1 into another folder on my desktop.
After, installed the update, then before you restart, remove AppleACPIPlatform.kext, (had to remove this also, AppleHDA.kext, this had caused me problems lost audio and other booting errors)
Then install them again from the copy from 10.8.1 folder on the desktop (used Kext Utility) Repair permissions and rebuild cache.
I can't remember if I copied the other audio kexts or not...but I was using the Multibeast Lion version for audio since Mountain Lion was messing up and wouldn't allow me to boot.
I removed this nullcpupowermanagement.kext also but I am running a patched bios and running a native AppleCPUPowermanagement.kext.
I am getting a slightly higher Geekbench score ~14350 or so (sorry its off the top of my head, currently in Windows) Currently finding it very stable.