if you want a road specific pedal, get the speedplay zeros.

easy entry (after initial learning curve= 30-45 minutes)
adjustable float (15 degrees)
easy maintenance for pedals and cleats
cleat covers are cheap and work very well ($10)
platform converters are also fairly cheap if you dont want to clip in ($20-30)
more connection than mtb pedals= more power, more comfort
lowest stack height= easier to spin in circles=efficiency
tastes delicious