My sister-in-law shoots with a 18-200 on her D90 and I really don't like the results from that lens (and she's a pretty good photographer). I have the 70-300VR and it is a great lens for outdoors.
The lenses you mentioned will give you poor results in low light, unless you bump up the ISO on your camera (or use a speed light if you are close enough)
You might want to look at a Tamron 17-50 2.8 or the Sigma equivalent (you can pick them up used for about $350-400) or a Sigma 17-70 2.8-4 if you can find it, and combine that with the 70-300 VR.
Good luck.
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