I'm in pretty much the same boat. I have the same motherboard, want to run with a 133MHz bus, and am not sure how my video card(All-In-Wonder 128) will react. It will probably croak.
From what I've read on the forums, people seem to agree that GeForce2 cards don't have a problem with the overclocked AGP bus(some discussion on <A HREF="http://forumz.tomshardware.com/hardware/modules.php?nam..." target="_new">this thread</A>). Don't know if doing this shortens the life of your card or not, but it should be stable.
If you can, find a vendor that lets you exchange CPU's. That way, if the P3(133) doesn't work out, you can exchange it for a P3(100) without being charged some obscene fee.
I ran an old Creative TNT for more than a year no problems at 133 with 2/3 divider on an Abit BM6. But now I've got a Radeon All-in-Wonder on a KT7a.