Headset advice
Hello Shooting Star,
I've never regretted buying my Bose A20 headset. In helicopters, more than fixed wing jets, I believe there are many really damaging audible frequencies from the gearbox and main rotor, to which the PiC is vulnerable.
Look after your hearing with the A20 kit. Why not borrow some from a colleague before you cough up £975. I think you'll find it's worth it.