Back in the early eighties I was racing in Europe. I bent a lid all out of shape at Spa and shopped locally for a new one. What I ended up with was a Levior. The Levior was light and comfortable, it had the first vent based demisting system I'd seen and, to this day, remains one of the best helmets I ever used. You don't see them about much and I don't know what their quality is all about nowadays but they were a bloody good piece of kit and might be worth looking into.