Jono, As you're in South Africa, have a look at the African forum.
I am not quite sure the paths open to you in South Africa, but it's not outside the realm to go from bush flying to twins to flying turbines and then go to the airlines. You just keep gaining experience appropriate for the next job.
Do some research on what you normally need for the jobs, eg if SAA need (for eg) 3,000 hours with 1,000 hours on turbines, then plan your moves.
See what the regionals want and work your way to a job you can get with the minimum experience.
