We are also headed to SA for a visit to Capetown(and the winelands) then on to Botswana and Victoria Falls. Check out
www.wilderness-safaris.com website. That's who we are using and they have won lots of awards for their safaris and attention to the environment. If you are interested, email me and I'll give you the name of the agency we used in the U.S. to book through. The agent is extremely knowledgable and I highly recommend him.