Either way, you need to realize that the default FSB speed for the BH6 is 100MHz. 100MHz based PIII are the ones without the B designator (or is it E?). If you get one of the B designated CPUs, it will not run at its designated speed, since the multiplier is based on a 133MHz FSB. Go with the fastest CPU you can afford, preferrably a PIII. You can try to overclock the FSB in order to run a PIII EB at the proper speed (or faster). I would suggest not going with the Celeron, simply because of the 66MHz FSB. Sapasion and others, however, have had great success overclocking Celerons. Don't make any decisions 'til you get a few more responses.

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