I find platforms and straps the best set up for street. I've got some plastic Haro pedals and Holdfast straps and they rock. I've got a clipless setup that I run on my road bike with Shimano XTs and some Shimano shoes which I've had on my fixed gear but for riding around the city, I like the platforms and straps way better.

Think both the retention and convenience of platforms and straps is way better than clips and straps. Also you can wear whatever shoes you like, adjust quickly and not mark up the shoes with the clips (metal clips sometimes leave marks).