I would use an Optima Red Top, or Yellow Top. Both Excellent Batteries.
Whats really important is aH (ampere hour) and the cca (cold cranking amperage). the higher the better as long as theyre 12V batteries.
there arent really any downsides to having a bigger battery than required other than a physical size difference. the bigger batteries (more powerful) mean that the battery will last longer when not being charged by the alternator.
having a smaller battery is a bad thing cos it could mean that the battery will not start your car as it doesnt have enough cranking capability. this also means that the battery will run down quicker.
best is to find a battery that will fit best in your car.
I personally love the Optima Range of batteries. Theyre durable, long lasting, superb cranking, and look cool. They are pretty expensive though. Last I checked, the Red Tops were going for around R2.5k.
Another favourite battery of mine is the Deltec Range of batteries. Also great batteries. Better than the Sabats / Willards / Raylites or similar. Not as expensive as the Optima, actually slightly more expensive than the usual batteries. Personally, I think that theyre worth the slight difference in price.
In my past I was a SPL competitor with my Corsa. I had various batteries in my car. I had Willards, Sabats, Deltecs, Optimas, Kinetik, and Northstar. I found that the Deltecs and the Optimas were the best automotive batteries.
These were my personal experience. I trust Deltec and Optima. You can google Deltec Power, and you will be able to find a dealer near you.
p.s. Deltec batteries are not made locally. They are made by Delphi in France. Deltec stands for Delphi Technologies, as branded by the South African Distributor. Deltec Power also stock Optima Batteries.