I'm a shoei kinda guy too, have two of them. Arai's are just too snub nosed for me, and I have considered the flip front, but if you wreck in one of those where you hit your chin, you might as well have an open face on.
As for HJC fit/sizing, give this a shot, taken from http://www.newenough.com/hjc_helmet_fit_instructions.htm
As for HJC fit/sizing, give this a shot, taken from http://www.newenough.com/hjc_helmet_fit_instructions.htm