I'm a fan of float. Currently I'm riding Bebops on my MTB and road bike, but may get some Speedplays for a new road bike, as they are a little easier to get in and out of. The Bebops are lighter than the Speedplays save the X/1s, which have a weight restriction of 185 lbs if I recall correctly.

If you don't like a lot of float, I'd look at the new Speedplay Zeros on the road or the Crank Brothers Egg Beaters on an MTB.

If you don't mind non-mainstream pedals, look into the Coombe and Keywin systems as well. Both have dedicated fans.