MSA Gallet or Alpha Eagle?  

provides the coolest wear, aka lowest head temp.  Wiring/avionics can be adapted.  I always wore suspension types, adapted to my wearability.  Generally hate helmets unless needed in the normal and practical sense of operations such as military and HAA.  Not fun banging one's head on a door frame or other parts of the machine just because 'time is of the essence' and the 'hurry-up' attitude prevails.