I will be visiting Botswana in June/July and currently assessing my camera gear.
Latest Idea was to sell everything I have bar the 70-200 2.8 IS II (I can't part with this) and along with the $$$ I had put aside to buy a Canon 500 F4 IS and Sigma 120-300 sport buy;
1. Canon 200-400
2. Canon 70-200 f4 IS (or use 2.8 not sure yet)
4. 5D mkIII
My biggest concern I guess is the loss of the 2.8 from not buying the Sigma 120-300 along with the loss of reach from not buying the 500 and selling the 1d4 and 7d.
Would really like to hear from those who have been to Botswana, did you find yourself needing F2.8? The loss of DOF from 2.8 is another thing I'm worried about loosing.
Also did you find yourself needing more than 560mm? Not having the crop sensor bodies which I could mix and match around lenses is a worry as well.