Hi That link was really helpful. I am looking now at going down the Nikon 80-200mm f/2.8 AF-D ED route as it appears to be great value for money. Reading Kens article there is a paragraph, and I quote:
"Not for: I wouldn't bother with this heavy professional lens on a DX camera. I'd use any DX lens, like the 55-200mm VR, instead. This lens will not autofocus with the cheapest D40, D40x, D60, D3000 or D5000; get any AF-S lens like the 55-200mm VR or 70-200mm f/2.8 VR II instead for those cameras. This lens requires moving a switch to get between auto and manual focus; you'll need a newer AF-S model if this is important to you."
Why would he not be recommending this for the D7000?