Madikwe. It does have some helicopter tours that are apparently awesome. Unless something has changed though you won't see the Wild Dog pack there and you are less likely to see all of the big five at Entabeni. If you are able to hit a couple of parks it is probably one that should be on the list but if you can only hit one then you may want to do Okavango (Botswana), Madikwe, or Kruger.