My feet are UK13, US 14/15, EU 49, the only shoes I know that fit are northwave centurions, the sidi ones mentioned before, and i believe shimano do some up to size 50 too though i'm not sure on that. Personally I use looks, but i don't think the foot size makes too much of a difference as to what pedal to use, only what pedals are supported by the shoe that you buy which is normally most of them.