for an eb coppermine, I'd vote for the Tyan s1854 Trinity 400. It is the most stable board I.ve worked with at 'default' voltages. It is not as good of an overclocker as some other boards. But since you have a 133mhz processor, you don't have much overclocking potential anyways (which is OK for me since my p3 500e won't overclock to save its life). My tyan setup is much more stable than my main asus setup (even when I don't have the asus overclocked), byt the asus overclocks better than the tyan. Also, the Tyan board comes with both a slot 1 + a fcpga socket, so no slotkit will be needed. Every micron computer with a coppermine uses this motherboard because of its stability. Also any VIA 133a board will allow you to run your memory at +/- 33mhz (so you can use pc100 memory if you dont have any pc133). Also, the Trinity 400 is one of the less expensive boards (@$90)
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system 1
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Asus P3V4X
P3 550e @ 733mhz (will do 794 stable, but its hot!!)
golden orb cooler
192 MB Micron PC 133
Visiontek GeForce DDR
SB Live Value
WD 20 GB 7200rpm HD
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system 2
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Tyan s1854 trinity 400
P3 500e
128 MB Micron PC 133
Voodoo 3 2000 (at 175mhz)
SB Live Value
Maxtor 10 GB 7200rpm HD