Don't believe everything you hear. First of all, your board does not support 133MHz FSB in BIOS at all, no Intel BX boards did. Most other companies supported 133MHz FSB with the BX, just that Intel is one of the few that didn't. Compgeeks caries the 1000E (not EB) in a Slot 1 version, which is 10x100, but your board does not support the proper voltage for it. In fact, not just any PIII 600 would fit, only the early "Katmai" core processors which used 512k of half-speed, off-die cache. And those are rare and pricey, along with performing worse than the later Coppermine core processors.
You can run a Coppermine on that board if you modify the detected voltage to 1.80v or higher, as long as you do NOT use the latest BIOS. What you need is a BIOS that is about 2 or 3 steps back from the latest. Intel updated their BIOS to NOT support the Coppermine CPU on this board, even though it was previously compatable on later revisions!
So as long as you're using a BIOS that's LATE enough to support the Coppermine, but EARLY enough not to have the Coppermine disabled, and as long as you modify the adjusted voltage to 1.80v or higher, you'll be fine.
The easiest way to do the voltage change is to use a Socket 370 CPU and a Slotket with adjustable voltage controll. The next easiest way is to use a standard slotket and make a jumper wire for it.
The Socket 370 "E" series was available in very small quantities at 1000 and 900MHz, but these are almost impossible to find. The 850 is easier.
Now that Powerleap kit is starting to sound like a good deal, no?
<font color=blue>At least half of all problems are caused by an insufficient power supply!</font color=blue>