Thank you Leo, Appreciate the info! I'm not necessarily in a big hurry as the 70-210 is working for me presently. Not sure if I will go with a 7100 or D600 in the future, so trying to keep that in mind as well. I have to say though, as good as the images are coming from my D300, I'm also not in a hurry to replace it, it's only got approx. 7 or 8 K images on it and I love the ergonomics and balance of the body. I'm thinking, with my 16-85, the 70-200 f/4 with a TC would be a very good match. Same filter size and very nice size lens, not to big or small. We'll see. Thanks again!