Get the Abit ST6 with MCI PC150 SDRams. Will give you the most FSB, I am still running a P3-S 1,13 at 170 FSB with stock cooling.
Also the P3-S are way superior to the Celerons... just hard to geht the 1,4Ghz P3-S up high because of its default 133Mhz FSB and its power needs at a decent Vcore being too much for any unmodified mobo of that day.