bennybmn,
I have the same problem as you, - namely a huge cranium.
The only helmets that fit me is a HJC half-shell, or an Arai XXXL. In a full-faced helmet the Arai XXXL is the only helmet that fits. HJC does come close, but Arai is just right.
I did try on one of those funky HJC full-faced helmet with hinged chin-piece, and it seemed to fit. That might be an affordable option as it was under 200 bucks.
Good luck,
-BT
