I have both the 18-55 and the 55-200 for my Nikon D40. The 55-200 usually stays in the camera bag around town. The 18-55 usually stays in the camera bag when I'm in the field. I have probably shot 10 times the pictures with the 18-55 than with the 55-200. The only way I'd part with either is if somebody handed me the 18-200 to take their place.
I find the 18-55 is the most useful lens for anything but wildlife. I have shot some landscape with the 55-200, but only when the 18-55 won't frame to my liking. The most recent example was a sunset highlighted copse of trees on the horizon several miles away. (It didn't turn out very well, but that was my fault.
)
The point I'm trying to make is that they are both useful, when used in their own environment. I would check the quality of the 18-105 and think carefully about selecting, instead, a longer second lens. The extra reach of a 200 or greater lens is something you will sometimes lust after.
Pops