Do you already have MTB shoes? If so, just go the SPD route. Personally, I like the 105 and Ultegra SPD-SL pedals quite a bit - but I don't walk or tool around town that much on my road bike.
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"The older you do get, the more rules they're gonna try to get you to follow. You just gotta keep livin', man, L-I-V-I-N." - Wooderson
'14 carbon Synapse - '12 CAAD 10 5 - '99 Gary Fisher Big Sur