I would think the ST6 would be a fine board. I have not used it, but have 3 SE6 mobo's that easily oc the Cele800 to 1.1G/133. And ran my Sdram at 222 timing. Using 1.80v, Intel fan/hs.
Hopefully someone will respond who has that board.
Have you checked Gigabyte. I like the EasyTuneIII that lets you oc from windows, you can tinker with settings until you get what you want. then save the settings.