Welcome to Nikonians! Even the Nikkor kit lenses are optically excellent. As you have noted, the 18-105mm having a wider range is a little more convienient than the 18-55mm and 55-200mm combo since you might not have to switch leses as often. If you want to have your cake an eat it too, the 18-200mm is another option though significantly more expensive and not quite as good optically as the others you list.
Neither the 18-55mm or the 55-200mm are very large or heavy so carrying a second lens should't be much of a problem. I would get the two lens kit. If you can, consider the 55-300mm instead of the 55-200mm. It is only a little more expensive and provides significantly more range.
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Thanks in advance. Good Luck and Enjoy your Nikons!