GPA's and the IRH Elite are the only helmets I have ever found to fit my round head. The IRH Elite is the only one in their line that fits decently, I have good luck with most GPA's although I currently have a speed air.
i caved and bought one this summer after one too many falls with my Charles Owen.. and i didn't realize how round my head was until i put on a correctly-fitting GPA! watch for sales at Dover.. they will discount the GPAs once in a while.
if you can't bear to part with that much cash, there are IRH models that fit similarly.
Proud member of the "I'm In My 20's and Hope to Be a Good Rider Someday" clique