I've got sciatic (SP?) nerve issues in my right hip/upper leg, so 'float' is very important to me, important enough that I use platform pedals. As long as I can move my foot around a little every few minutes there's virtually no issue with the nerve pain. My pedal of choice is the Crank Bros 50/50. The pins on the 'deck' help hold your foot in place, but make it easy to shift 'em around when you want. Also great for stop-and-go suburban streets where I'm constantly trying to avoid inattentive drivers.