While I don't have any first hand experience of fishing in SA, I used to work in fly-shops and have outfitted several parties headed down to Argentina to fish. Unless you'll be specifically targetting sea-run trout the 6wt will be your best bet for freshwater, 8wt will be overkill - even for those monster Argentinian trout.
Of course if you're planning any surf / beach fishing an 8wt would be nice...
Hope this helps - have fun, tight lines!
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