Hello,
the AF 2,8/20 - 35 D mm Zoom Nikkor is an excellent lens, a little bit large, but lighter and smaller and cheaper than the 2,8/17 - 35 mm which is even a little bit better. It is a professional lens made mainly from metal and not plastic. You can focus it manually quite well. Unfortunately it has no coupling for the exposure meter of your Nikon F or Nikkormat Ftn. This could be your biggest problem for all other more modern zooms from other manufactureres. Really good extreme wide angle zooms were offered only in the Autofocus era.