Since you're in South Africa, I would be looking at the most robust headset you can find. Typically, Dave Clarks are very tough and able to withstand pretty much any charter pilot can throw at them.
DCs are the headsets of choice for folks heading to the GA charter world so I would look at them closely.
For my bush flying days, 99% of the crew had DCs. I wouldn't trust any thing else. Now a days in the lil bizjet I use Sennheisers.