If you want a helmet that goes beyond the brain bucket concept, i would look at POC, who are the go do manufacturer for downhill skiing helmets and protective clothing - they are not cheap, but they are a quality product, and it says a lot for them that a lot of the top pros use them rather than get sponsored by another brand.
They have just started doing MTB helmets, and have some very cool innovative tech
VB
If you want a helmet that goes beyond the brain bucket concept, i would look at POC, who are the go do manufacturer for downhill skiing helmets and protective clothing - they are not cheap, but they are a quality product, and it says a lot for them that a lot of the top pros use them rather than get sponsored by another brand.
They have just started doing MTB helmets, and have some very cool innovative tech
http://www.pocsports.com/en/14/wheels-helmets
Safety tech
http://www.pocsports.com/en/content/view/protective-concepts
There MIPS system is very cool
POC Receptor Backcountry MIPS Helmet - YouTube