I believe Arai and Shoei offer great helmets however they are primarily designed for motorcyclists.
Ive not checked out their product assortment lately but dont recall they offer SA designation.
A good investment and a better long term choice would be to get an SA approved helmet with fire protection from a company that specializes in auto racing gear. Obviously fire is not so much an issue when crashing a motorcycle or snowmobile but trapped in a burning car is a different matter.
My 2 cents..Wayne