Sad to hear what your brother did to his family but its to your benefit and can experience a truly different side of riding.
All standard visors fog up but there's pinlock systems for various makes of helmets that work well. Earplugs are cheap and do help with the high frequency wind noise and shouldn't be ignored. Wind noise causes tinnitus and just wears you down. That being said....
Helmets are like footwear -function, size,graphics and cost
Since I have a spectrum of bikes (DR650,Bandit 1200-very similar to the 919!,Venture 13 and XV750)with helmets/visors/cheekpads for each all I can say is get what fits you properly and you can add to it.
Shoei Quest,Fly Trekker, Caberg enduro flip up and a Bell MX9 Adventure are on the shelf and each one works for certain rides and were all bought on sale and over time.
I can only get my mellon into a few helmet brands so time should be spent at a bike show or perhaps at many shops trying on various brands.
Have fun!