I'm also thinking of an adventure style helmet and like the light weight of some. But in the meantime you might try this little trick with your full faced helmet, especially if you ride with the visor up most of the time. Get some black electrical tape and stick it to the bottom 1/2 inch of your visor. Then when ever riding into the sun you just adjust the visor to block the sun out. Its works just like the visors on your car and way more effective than any snap down sun visor found in many helmets these days.I am looking at getting an adventure style helmet, for the peak really.
When and where i ride the peak will cut down on glare so i can see skippy, a bit early!
Bike is a 2006 R1200 GSA, if anyone has found any problems with the screen and peaked helmet use?