The Nikon DX 18-200 VR lens is the perfect jack-of-all-trades superzoom lens to leave on the camera 95% of the time. You won't miss shots because you were changing lenses. You won't get as much dust inside the camera and lens from switching lenses. The image quality is excellent, especially considering the 11:1 zoom ratio. There is a complex distortion on this lens, but it is not too objectionable, and can be removed with software like DxO Optics (which I highly recommend.)
Eventually you will want to take shots of moving targets (kids, sports, animals) and then a faster lens will lure you into spending big bucks. I have several F/2.8 zooms for this reason. F/1.4 primes are even better, with less distortion. Another advantage of the faster lenses is the ability to emphasize the intended subject by using the narrow depth of focus to throw everything else in the frame out of focus. At 50mm and F/1.4, the depth of focus at close range is less than an inch.
Spend some time at
www.kenrockwell.com, there are good articles there explaining how to make a good picture. Great photos are 99% due to the photographer and 1% his equipment. Good equipment should just make it easier/faster to get the intended result.
I have been having a whole lot of fun with the Tamron DX 11-16mm F/2.8 lens, which I post-process in DxO Optics to recover spheres so people's heads look normal. This lens is actually sharper wide open in the corners than the Nikon FX 14-24mm F/2.8 (wow), but the field of view that you can get with the 14-24 is about 10 degrees wider (if you put it on a full-frame sensor like 35mm film.) Wide lenses are best employed for exaggerating distance. I also find them useful for indoor shots where you just can't take a step backwards.
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