LL - yeah, if you are doing a muddy race like the one you posted on the race forum, you need times or eggbeaters.

Get the SL's if you are worried about durability. I have a ton of riding on it and I busted one spindle over the course of 3 + years. you'll have to rebuild them every year or so, but it is really just swapping out the bushings and bearings. really easy. and the grease ports keep the pedals running smoother longer.