I second the TIME ATAC MTB pedals/cleats I've been commuting and touring on a set for about 5 years now with almost no maintenance at all. I did take the bearings out to grease it up once but I did that out of boredom one day rather than necessity.

MTB shoes tend to be a lot easier to walk in. If you are looking at keeping your road pedals, perhaps Lake makes road shoes that are more walkable, i.e. have more traction on it to go over the larger road cleats.

Jay