The Dynafit Tourlite Tech's are the lightest binding out there 1/2 the weight of the others. But you can only put 1 sole length on. They have a 3rd redesign of the Tri-Step out this fall that should be less finicky, and more adjustable, but we'll see about reliability. Fritschi's are a good binding, and have all the stepin ease of alpine. The Silvretta 555 is a slightly heavier, but just as nice as the Diamir - it's NOT moutaineering boot compatible. For that you want the Silvretta 500.