I think you might find this article very interesting wrt bike helmets.
http://www.vox.com/2014/5/16/5720762/stop-forcing-people-to-wear-bike-helmetsMyself, I have some 80$ helmet that I bought at the bike shop with my bike, and I do like to wear it, but just thought you'd find that article as interesting as I did. It's a bike helmet, I don't know if there is a "BIFL" for it, as if you crash with it, it would be a very good idea to make that be the end of your relationship with that helmet, just like with motorcycle helmets I'd think. Also, there's so much stupid and "uber full hardcore" ridiculousness with bike helmets that you should really look at what your paying for.
Edit: Reread your post. The Giro Aeon 2014 is 224g, with an
astounding 28% weight reduction from the prior version!!11!one. This is exactly what I'm talking about. My dumps weigh more then my bike helmet(a 350g Bell Volt).
I commute 6.5 miles to work. I wear shorts, or pants. I never wear bike shorts, and I don't wear any biker clothes when I'm riding for pleasure either. Hat's off to those of you that get full into it, but there's no need to get "into it". The most pressing need is to get
"onto it", which does not take $$$$'s to buy into. I ride a Surly Cross Check.