I used crank brothers pedals for several years and never really liked them. I always found them to be more difficult to clip in than SPDs, and the pedals break and fall apart too often. I've had to have several pairs replaced through warrantee. SPDs are much more reliable and sufficiently easy to clip and unclip from.

If you are going to be riding with normal shoes sometimes, get thees...Shimano a530


or these...PD M324