D-C shell that takes a standard headset - IMHO these are pretty poor compared to the mil helmets
Not sure why you think this. The DC helmet is quite light and has an inner cloth helmet separated from the shell. The advantages are the light weight and they are cooler in summer. Not sure whether they give the last 1% of impact resistance compared to Kevlar/Carbon fibre. But do you need this as any impact that damages the helmet is likely to render you unconscious.
I don't know what the DC helmet is made of. Its plastic, but I don't know if it has any reinforcing.
Price is $360 in the US plus a headset.
ZA