Dude
There was a school, in Midrand Airport but as fas as I know it closed down so theres nowhere you'll get JAR cert. But as you pointed out, SA is both cheap and the weather is perfect. the conversion to a JAA PPL when you get home involves some exams and a flight test. They only recognise the hours.
I'm planning on going their end of next year. Expense wise between £2-3K incl accomadation is all you will pay.
Ciao