Shooting action at f8? No thanks.
I shoot VERY high speed action (200+mph model aircraft) at f/9 all the time. It's a perfectly practical thing to do in direct sunlight.
This R/C plane was going over 200mph, and this was shot at f/9, ISO 400 and 1/2000th.
that's 70-200 + 1.4 tc and 20D
Actually, that's 70-200/2.8L IS + two 1.4x TCs (one of them isn't visible to the lens and therefore doesn't end up in the EXIF data).