another vote for spd-sl's. ive gone from only using spd or eggbeater with a crappy commuting/touring shoe to specialized carbon shoes and 105 pedals. a serious diference in energy transfer, stability and confidence in my bond with the pedals. not good for commuting, or walking but for speed and comfort, very nice.
oh, i wear 49 shoes. one thing i like about the spd-sl is that i really get almost no float (this is using the yellow cleats, which have 5-8 degrees float) which i like very much. if you like a lot of float, these may not be for you.