Another rec. for Keen Commuters here. I took mine on tour earlier this year and they were great. I loved having one shoe that was good for everything, including some nasty campground showers. They feel plenty stiff clipped to my M520s.

The one and only thing that I don't like about them is the styling; I never would have picked them out for a normal shoe. However, they look OK enough with jeans, shorts and casual skirts that I commute in them and usually wear them all day.