I did find the N75 service manual (it is $1.00 at the Learn Camera Repair site) and it is amazing. It has detailed COLOR photographs of the disassembly process. Though one still needs to get access to the computer program for the diagnostics.
I wonder if the same kind of manual is available for N80/F80 and if the program you mentioned in your post, is available at any price at all.
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As for the lenses, I was considering to get 28-80, 28-70, 28-200, all of which were dropped down after I got my hands on 28-105. This lens does pretty much everything I need, except for telephoto use.
