I am a new owner of the D7000. Currently have a couple lenses and looking to buy a multi use zoom, that will be used mostly for PORTRAITS for now. I also have a four year old boy that I would be shooting at his activities such as as sports, drama club, etc. I have a cheap consumer grade nikkor 70-200, but have never been able to get acceptable results from it. With the new D7000 I am ready to invest into a pro quality glass. I will be buying used, nevertheless. Is there the best place as far ad reputation and best prices to get used glass from? Looking for ideas of what lens I should be looking for. Somebody is selling a 80-200 f 2.8 AF-D ED macro for $700 locally. Is that a lens to get and is it a good deal? Or is there another one you would recomend getting? Looking for something that wod last me many years to come with great results that will not keep me looking for something else. Any ideas will be great appreciated.