A good helmet which i use with a PC9, cannon EOS 500 and I endorse fully is the Bonehead optic good quality, robust and safe. Its good to do a cutaway mod on any helmet you buy though. Bear in mind thats my opinion others may varey
laterz
http://www.freeflyeuphoria.com Grant a.k.a "The Wookster"
Euphoria freefly
http://www.freeflyeuphoria.com