I really believe in softshells and always had a pretty tough, bombproof hardshell. But now that I have really converted to softshells, I'm trying to look for a lighter weight hardshell, too, considering my current one is probably 1.5 pounds. But as people said, when you go lighter, you sacrifice durability.
I can't afford it yet, and if money is no object - it's kind of ridiculous how expensive these shells can get - look at (sorry for dropping brands):
Arc'teryx Alpha LT is 13oz
Patagonia Stretch Ascent at 16 oz.
Mountain Hardwear Optimo at 15oz, and
OR Mentor at 17oz.
Rab Latok Alpine 17oz
I really like the Arc'teryx and Patagonia if I can find it cheap enough. Also available is the Patagonia M10, that weighs only 10oz. It's pretty sweet, but it's paper thin, and I don't know if it would handle somethings like long alpine rock climbs, dense bushwhacking, or glissading. But worth considering if you only want a wet-weather backup to a softshell.
But if you don't have a softshell, consider that first, 'cause they perform amazingly in the winter and alpine conditions.
Aviarome