I am looking to buy an everyday lens so that I use my D7000 more. I have been looking at a new Tamron 18-200 or a second hand Nikon 18-200 (1st edition). The reviews of the Nikon are favourable, but second hand it is still twice the cost of the Tamron. Does anyone have any experience of the two? I am leaning towards the Nikon at the mo. Thanks, Sarah