18-55mm is fairly cheap quality and just generally sub-par, but good for wide shots. I would suggest the 18-105mm Nikkor, I love mine and rarely swap lenses for my purposes -- perfect for tank shots, portraits, landscapes, and almost anything I shoot. If I'm not shooting any of these I'm usually shooting wildlife (i.e. birds) in which case I whip out the 55-300mm.
"Simplicity is the ultimate sophistication." -- Steve Jobs