Good Old Aussie driver is probably down to his last nickel. Take a look at
www.ebay.com Most reasonable and cheapest is the SPH-4B. Consider it comes with a different Impedence so the mike and earpieces will need changing for civilian helicopters.
SPH-4 is too old and SPH-5 is newer, a bit more expensive and also needs changing.
Since your a Helicopter Driver you have a big head to compensate for the other one, dont get any size less than XL, you can make then smaller, but you cant make them bigger.
They pop up once in a while for sale. Should be able to get a used one in OK condition for around $200+ shipping, maybe more.
You can see them at
www.gentex.com
Mine is all cherried out and you can see it at
www.smokinpaint.com Its the blue one. Had
www.flightsuits.com fix the electronics and added a lip light combination xenon/green LED
www.seitzinc.com
So cheaper than a new one, if you have some time you can look like a million dollars and tell all the the Sheilas. " Hi, my name is (fill in the blanks), I fly Helicopters."