With a bit of a voltage bump, you can overclock those 66Mhz bus speed Celerons to the 100Mhz bus.
Also, that 566 Celeron is probably not as fast as a 500 Mhz P3 despite the clock speed advantage.

The P3 has more cache and a faster bus.

Look for a 1Ghz Coppermine P3 FCPGA. You can find them all over Ebay for about $10.

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I only used the Celeron 566mhz chip to verify that the slocket adapter worked. It is not intended as a permanent solution by any means. The 700 mhz one would have been much better if I could have found it.

A 1ghz P3 Coppermine processor would be nice, but it uses a 133mhz bus speed. This old motherboard uses an Intel 440BX chipset that tops out at 100mhz. If the chipset is overclocked it also overclocks the AGP and PCI buses. Given the age of the cards in here (Aureal sound anyone?) I have my doubts about running them beyond their specs.

I saw a newer slot 1 VIA-based motherboard last weekend that ran up to a 133mhz bus but sadly it was dead.