I second the shimano spd, I got the 520 dirt cheap $50 or so. Use them on road and off road riding. The only issue I had with them was when temps got 95+F the cheapo mtb shoes started giving me hot spot on the feet on 50+ miles, though good pair carbon soles mtb shoes fixed that. Another thing that sold me on the mtb style pedals for road riding on a you can walk in them after falling down a flight of stairs in my complex with my road shoes while carrying my bike, don't worry the bike was ok just bounced down the stairs but my back was sore for a week. While I will admit I had a little more solid feel and more float with my looks I can't recall ever unclipping by accident with my spds. Pretty much maintenance free I don't even know the last time I even put some grease on them. MTB cleats seem to last forever and you make a cool crunching sound when walking on concrete like you are squashing large cockroaches.