I would say double-sided mountain bike SPD, and whatever SPD- capable shoe you want. I love the Shimano sandals, myself, but there are other suitable models and other brands. To give you an idea of how much I like this setup, my otherwise all-italian lugged steel road bike has, sacrilege!, these Shimano double-sided pedals on it. It's just too convenient to use for normal, everyday riding, at stop lights and such. You just step down on them. No need to even look. It's up to you, but they are very secure for pedaling even if the tension is backed off the whole way (which makes it dead easy to get in and out of and doesn't stress your ankles either).