Helmets can be a very subjective matter. So these are examples of some helmets in common use.
The trend in helmets are lighter weight while providing the same protection levels. There is a new ballistic helmet coming out this year that will weight less than 1 kg and still provide the same level of protection, I'll add ths once the details are available.
Helmets:
http://www.thesupplybunker.net/pdf/4...mets_rev11.pdf
Helmet Accessories:
http://www.thesupplybunker.net/pdf/4..._acc_rev11.pdf