Thanks for all your help. I'm definitely leaning towards tours where I can.

Last question (hopefully) regarding budget. Do you think $5000 would be a reasonable expectation of how much everything would cost? I'm thinking.....

$1000 for TATL flights
$1000 for intra-Africa flights
$1000 for Namibia tour (meals and accommodations included)
$750 for Okavanga Delta tour (meals and accommodations included)
$500 for 4 nights in Cape Town/Johannesburg (2 people/room)
$750 for meals, possible night(s) in Windhoek/Maun, etc.

I'm overestimating by quite a bit, especially the last two items, but I just want to give myself a nice cushion.