I know the OP has already booked, but I did my own Safari around Kruger a few years ago. I booked everything myself - flights, car hire, rest camps etc. Didn't come to much money at all and I had a great time. We did organised safaris from the rest stops, had a braai every night, stayed in some really nice rooms (Olifants rest camp was a highlight for me, looking down from the top and seeing animals crossing the river
https://www.google.co.uk/search?q=o...KuyAGA7oDACw&ved=0CAkQ_AUoAQ&biw=1467&bih=499) and got to see the big 5 and take our time going between camps as we had our own car.
My only regret is going with my ***** of an ex and spending money on her.