Helmet advice?

[Fredwina]

and now, for the obiligatory "Bell and Giro are the same company" and "check out http:/www.helmets.org" posts
try them on, yes. even the same will fit differently across the model line.
I had to buy one and came home with a Specialized Propero.
helmet life - i think we've debated that to death, too
Bell says two year, but the Snell foundation(http://www.smf.org/) recommends every 5. So 4 years is a good timeframe