I have the Nikon 55-200 which I use on my D7000. Not the fastest aperture but it is cheap - extremely cheap at the moment Nikon 55-200MM F/4-5.6 AF-S VR DX Black Lens: Amazon.co.uk: Camera & Photo
Ken Rockwell likes it http://www.kenrockwell.com/nikon/55-200mm-vr.htm
and I find it sharp enough. The AF is not as fast as on the pro lenses but I use it at bike polo with no problems http://www.flickr.com/photos/36707747@N07/7875013412/in/set-72157631278830868
http://www.flickr.com/photos/36707747@N07/7875809576/in/set-72157631278830868
It's also very light and on the D7000 gives you a portable and very useful 300mm.
@WillMelling started
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I have the Nikon 55-200 which I use on my D7000. Not the fastest aperture but it is cheap - extremely cheap at the moment Nikon 55-200MM F/4-5.6 AF-S VR DX Black Lens: Amazon.co.uk: Camera & Photo
Ken Rockwell likes it http://www.kenrockwell.com/nikon/55-200mm-vr.htm
and I find it sharp enough. The AF is not as fast as on the pro lenses but I use it at bike polo with no problems
http://www.flickr.com/photos/36707747@N07/7875013412/in/set-72157631278830868
http://www.flickr.com/photos/36707747@N07/7875809576/in/set-72157631278830868
It's also very light and on the D7000 gives you a portable and very useful 300mm.