http://www.nikonchat.com/nikon-18-70-nikkor/

Sell my Tamron 70-300 to Nikon 55-200, I?
I bought a Tamron 70-300 non vr in a kit with my D5000. I `m fascinated by the quality of the body standard camera and the 18-55 Nikkor lens, however, find the images Tamron are a kind of soft. I don `t really know how it compares to, but it I heard the Nikon 55-200 is much sharper (apart from vr). Also, does anyone know the difference between 200 and 300? Is it too much? Is it really 1 / 3 more for the tamron? Any comments or experiences are very welcome. Thanks,
Take the camera and Tamron lens in a camera store and test them against nikkor 55-200 mm
Up close encounter with Humpback Whales in Maui – January 25, 2010