Bud firstly where in SA are u ???
The most popular high end car in SA at teh moment is Tamiya TRF's both belt and shaft ,next would be Cyclone and Xray.
Wouldnt recommend Xray ,they have the worst back up locally.
The Pro4 you is not bad at all and is more than capable of holding its own at club level.
For stock 540 class the shaft drive cars are more popular.
In superstock (27t) its more mixed as this is the most popular class.
A good kit to consider is the TA05R and spares is readily available for Tamiya.
I run a Top Racing Scythe and and a TRF415ms.
casterracing EX-1 Pro, SP Silver Arrow
TOP Racing Scythe, SP 17.5, SP GT Pro 2.0
TOP Racing Scythe, SP 4.5 V2, Hobbywing Xerun 120SD 2.0
TOP Racing Scythe, SP 13.5, Hobbywing Xerun 120SD 2.0