I'm new again to cycling, having just started up again after 15 years. I just got SPD pedals on my Trek FX 7.5, the two-sided kind, which I've decided I'm going to keep since in a particularly dangerous, traffic-wise, part of town, I've already grown fond of having one foot unclipped and on the platform side for about a mile since I'm stopping every few seconds. I'm keeping this bike as my commuter. I'm also having a custom Gunnar Sport built right now, and co-workers have signed me up to be on their team for 165 mile, two-day charity ride. I'll be using this bike for training, longer pleasure rides, etc. So....I've been thinking about pedals and shoes, and trying to read up here and elsewhere, but I really don't understand the choices and what makes one style preferable over another. Any help would be appreciated.