I agree with Haggis' suggestion on Chenin Blancs from South Africa.
If you can find them, Sadie Family makes three excellent versions; Skurfberg, Skerpioen and Palladius. The first two are part of their Old Vine series and might be difficult to find. The Palladius is actually a blend but should be easier to find, albeit not cheap.
A.A. Badenhorst. He makes a 100% chenin blanc called The Golden Slopes. Outstanding stuff.
Ken Forrester, The FMC. His top of the line chenin blanc. Great stuff.
Keermont. They make a chenin dominant blend called Terrasse. Not quite as good as the above, but should be half the price of them. Closer to 25% of the Palladius.
Thorne & Daughters. Their Cat's Cradle is 100% chenin blanc. I don't have a lot of history with this one but the 2017 is killer.
De Morgenzon also makes excellent chenin blanc.
If you'd rather get a Chardonnay...Hamilton Russell.
Sadie Family makes several. Columella is a syrah dominant blend. Soldaat is old vine grenache. Treinspoor is tinta barroca.
Reyneke makes good reds, mostly syrah.
As does Keermont. A standard bottling and the single vineyard Topside.
De Toren makes an excellent Bordeaux style blend called Fusion V. It used to be a steal but I don't see it in our market anymore.