hey .. try
www.airlinecs.com
The program is called PerformOps - they have a reservation system too that can give quotes etc. Due to ZAR rate exchange this might work out very cheap for you as it is not that expensive locally either. You can buy the system in modules and only buy what you need. It is being used by a few smaller airlines and the system has been designed and moduled for smaller aviation companies that can't afford the expensive systems. It's web based and does not need SITA etc.
Hope this helps.