Update time: Been wearing an Abus Stormchaser for the last few months and would agree that it is light. Feels a bit cheapy to me though. Perhaps the two things are linked.
I felt this way going from a Synthe to an Airbreaker (couldn't get a Synthe in my size). The Abus does have a great compact shape for my silly shaped head but doesn't feel as plush/well finished as the Giro.
I have the Abus Stormchaser that fits my fairly narrow head, £90 on Sigma Sports at the moment and nice and light