Glacercub,
I don't wear one flying in the backcountry, but I probably should. I am counting on my BAS shoulder harness to work.
If you can afford it I would highly recommend buying a MSA Gallet flight helmet. Carbon Fiber/Kevlar, low profile, super comfortable, and VERY lightweight. It is the standard issue for the many of the European military airwings, our own Coast Guard, multiple SAR flight crews and many medevac crews.
One thing you have to remember is that helmets like the the Gentex high G helmets used in the fighters are not the best helmet for our low level high noise environment. Helicopter helmets are designed for forward impact and bird strike environments in addition to being surrounded by noise. If your life depends on it don't skimp on the protection.
In my job all pilots are required to wear helmets and even though it may not save us in a crash it may during turbulence and t-o and ldg mishaps. Most pilots who need new helmets are going with these and rave about them. I can't say enough good about them especially if you include CEP. Noise cancelling doesn't compare when you have used CEP, also standard now for military rotorheads.
Only 2 distributers in the US and Tiger Performance is great and have lots of experience to help set you up. PM me if you have other questions or want some photos.
Here is their link:
http://www.tigerperformance.com/aviationhelmets.html