I agree with the 125mm Fujinon suggestion. If I had only one lens for landscape, this would be it. If I had only one lens for architecture, it would be a 90mm (f 8.0 Nikkor is what I use). I also have a 65 and 75, but I use them a lot less. You will get them eventually if you need them, but your first lens should be more versatile (a less exaggerated perspective). Think about the great photographs by Strand, Weston, Atget- none of them done with really wide lenses.
As far as being able to focus a 65/75/90, remember that depth of field increases as focal length decreases. Shorter lenses are generally easier to focus due to their great depth of field.
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