just to clear things up a bit, incase you didn't know this:
PIII 800E - Coppermine PIII which runs on a 100mhz fsb
PIII 800EB- Coppermine PIII which runs on a 133mhz fsb
if you're going to overclock, go with the 800E
but i agree with compuwiz, chances are you aren't going to hit 133, but you never know 

 if you can find a 700E, go for that, much better chances, as he said 
