hi spike, maybe i can help, as an approach/area controller in Johannesburg with 5 years experience your net is approx 2500euro per month (this includes a station allowance of which Johannesburg has the highest in the country and all overtime and public holiday pay) . Tax is approx 38-40% and medical aid about 200 euro a month(of which the company contributes a % to) . These things are taken from your gross. Insurance and the likes differ from person to person. Obviously the net amount increases as the years of experience do.
hope it helps...