I have finally finished my review of our safari this August - we had the most wonderful holiday. Thank you to all the posters on here who helped us to plan our trip, your advice was invaluable.
We eventually decided on mobile camping, as it was the only way we could afford to visit Botswana during August, and booked a 14 day safari with 2 extra days in Livingstone to visit Victoria Falls. We chose to go with Bushways based in Maun on their Elephant trip, and were highly delighted with everything, from first contact to the end of the safari.
There really are not enough superlatives to describe our experiences, but I've tried.