I have found an older version of the nikon 80-200 AF 2.8 for sale at a local camera shop. I know that this version of the lens focuses much slower that the newer versions of the lens. How slow is slow. I currently have the 70-300 G lens on my D200 and find that the focus is rather slow. Is the focus on 80-200 going to be slower than the 70-300 I currently have? Also would you buy the older version at a cheap price or hold out for the newer version? Thanks