Don't believe the published weights!
I did a side-by-side weighing analysis at Marmot Mountain Works in Bellevue. I weighed all size 9's of the all the plastic boots they carry. Contrary to their hype and marketing, the heaviest boots were the Vasque Ice 9000, if I recall correctly, at 5 lbs. 13 oz. The Koflach Arctis Expe were lighter, at about 5 lbs. 10 oz., and the Lowa Civetta Extreme were 5 lbs. 7 oz. The Koflach Degre was only slightly lighter at 5 lbs. 6 oz. I didn't bother weighing the Scarpa Invernos, but I believe they may be the heaviest in the group, at over 6 lbs.
If your feet can handle them, I'd consider the Lowa Civetta Extemes. They're really versatile in that they can handle the low temps, and they're really low volume (which may explain the lighter weight) which allows better climbing dexterity.
