Joe I'm in the same boat as you, I have a D7000 and I have been buying up good quality lenses. I have heard that the 135 DC is great for portrait because it is a prime lens it should be sharp. The 105 is also real sharp and nikon make a micro (macro) f 2.8 105 which gives you the best of both worlds. These days you can hire a lens go out and shoot compare it for what you want to do. That way you can make the choice. I have read and read about the best of this and that and I have often made decisions on the basis of what other people say. I'm saying that for me this stops I am in a position where for a hundred bucks or so I can hire a lens or body go out and shoot for the day bring it back and make up my own mind. If I have dound then I will refer back to the forums on AP where I can be a little more specific about the question and garner peoples opinions. Probably not the help you are wanting but you are not alone on this one.

Kind Regards
Livio