Thanks for the very quick input. marekjoz, I have read that thread and that was pretty much why I put this question out here, I was about ready to go for the 70-300 but as I read this thread I thought that the 70-200 f/4 seems so good that it might be even better. But looking at the other responses I think 70-300 might be it for me, fast focus is important so it definitely is a factor. 'Native' is mostly better. Thanks a lot.