You have good taste my friend. You can buy the helmet just about anywhere.
>...A Z1R helmet is just...
I disagree. Some events (mine included) I wont let you pass tech with and M-motorcycle or DOT helmet. You must have a SNELL SA-00 or SA-05 approved helmet to get on the track.
Difference:
Basicallly the drop a bowling ball on an M helmet ONCE, and check for cracks.
SA they drop it TWICE, no cracks.
Also, ever see how a nylon interior helmet melts, sticks to you face, and then catches fire! DONT DO IT!!!