gsgary
Been spending a lot of time on here!
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It would be 300mmF2.8 minimum for me but i have that already
first of a lens on any camera has the same zoom range that it will have on any other -regardless of crop or not, you don't get more range out of a crop sensor.
What is different is that a crop sensor camera will only read the middle areas of a lens and will ignor the outer areas of the image totally.
eg:
Take two 10MP cameras, one crop sensor and the other fullframe and put the same 200mm lens on each.
On the fullframe camera the full image from the lens will be captured and recorded by the 10MP sensor and that data in turn put onto the photo from the camera
On the crop sensor camera the sensor will only record the middle areas of the shot - and it will put this onto the 10MP sensor
thus when you compare the two the crop sensor camera shot will look like you have taken the middle area of the fullframe one and blown it up larger (though with improved image quality - generally speaking). The image looks as if its come from a longer lens, but infact its only come from the same 200mm lens. The differences are less if you compare a 10mp crop to a 20mp fullframe camera = now the fullframe can crop and get an image from the middle areas same as the crop sensor camera of comparable quality.
wiki might explain it better: Crop factor - Wikipedia, the free encyclopedia
Summer(northern hemisphere) is a great time visit South Africa, its the dry season and there is hardly ever a cloud in the sky. The great thing is that you can use slower(cheaper) glass or teleconverters and still get awesome shots. Like others have mentioned Buying big glass might not be a good investment if you don't plan on using it much in the future. So I will suggest forget about upgrading your shorter lenses, they wont be that usefull and you don't need the extra speed during the day. A 70-200, is a lens I feel is so versatile that just about everyone shold have one anyway. Couple that with a 1.7x or 2x converter and you really have a good starting point for game drives. Now I shoot canon but I expect the 70-200 2.8 and teleconverters from Nikon to be just as good as canon. Even with any oem teleconverter, the quality is still very high, even for moderate enlargements, and the IQ will still kick the ass of consumer quality lenses. With the converters you can certainly make good quality prints, especially with how much you can stop down, and use base iso, with the availible light.
Clouds work as natural diffusers, and harsh sunlight all over the place really doesn't help your shots. I prefer cloudy days for shooting, just because the light is very soft and flattering.