We probably have more money in shoes and pedals.. than some people have in bikes...
We are performance riders.. and love the benefit of step-in pedals. Ideally road pedals and shoes perform better on the road, and mountianbike pedals work better off road. There are of course situations where one would use a mountain pedal when road riding. For one example offroad shoes are more walking friendly.
Our sloppier weather on-road rides and winter rides are done with mountain bike pedals, primarily because we have shoes that warmer, and more water resistant, set up with those cleats.
We have two different road pedal sysytems. The older Look / Shimano set up, and the newer Look Keo Set up. These two set ups are similar but different. We have a varitety of Time off road pedals.. but they all use the same cleat.
I did purchase a pair of Crank Brothers Mallet's last fall.. to try for downhill riding, but have yet to use them.
We do have more bikes than pedals.. so I do from time to time have to swap them out.