I wear these Northwave Wave mountain bike shoes ($65 at Sports Basement).



Although I use toe clips, I need to wear a stiffer-than-sneakers shoe to avoid getting sore arches. These shoes have a removable rubber piece in the forefoot so they can be adapted to clipless pedals. They're comfortable to walk in and I assume they're quiet because when you're not using the clipless pedal function, because you should be able to put back the removable rubber piece. However, I also keep a pair of dress shoes at my office because I have to wear business attire (shirt and tie) at work and these are a bit too casual for that.