Nikon does have a fairly huge array of lens kit and it does help if we can get an idea of how each one turns out in the hands of some users. With the current Nikon D90 kit lens (18-105mm VR) and 50mm F/1.8D in my inventory, I am contemplating a third and final lens for the Nikon D90. I mean, to give me a decent latitude while shooting.
Some friends of mine suggested a 70-300mm VR II glass (a tripod will almost be mandatory) to shoot wildlife and sports but its also equally tempting to delve on macro photography with a 60mm F/2.8.
Well, I am currently looking into it [here]. Perhaps, it may help you decide too.