they're not the lightest but I've found the New Balance RC769.
it weighs 8oz and comes in wide widths.
check it out.
http://www.youtube.com/watch?v=YCXnmjzcXl0&feature=related
http://www.zappos.com/n/p/p/7534344/c/744.html
I've trained in the New Balance 769 stablity shoe in the past.
Is it okay for me to train in this shoe 20-30 miles per week?