I think the ultimate system for me would be the flypapers, or the varients that are now coming out. These are flats without any attatchment. The pedals are so thin the foot just sticks to them 360 for max paddle efficiency without the problems of trap or bindings. There are even some custom frame options that one could get to with this design.

http://www.bikemag.com/blog/tested-m...ypaper-pedals/