After reviewing everything that I can find on the web, and looking at what I can spend now on a lens, it looks like I have narrowed it down to two choices - either the Nikon 80-200mm AF-S, or the older Sigma 70-200mm HSM II Macro. The difference between them is about $200, with the Sigma being cheaper, but the Nikon seems to hold its value better for resale. I am looking at getting one of them now, and upgrading later to a Nikon VR or VR II. From what I understand, I won't have to worry about corner softness with either, as DX is only using the center of the lens anyway. Looks like either of them can do what I need.