The viewfinder on the 80 is absolutely magic. Big and pretty bright for a modern small SLR (semi collimated, underprioritized and probably with pentamirror instead of prism, as they are).I have an N80/F80. It has more features than the N75/F75 and has some nice touches like the dial to select meter pattern.
It has better shutter/mirror dampening, perhaps due to the extra mass. It has a larger Viewfinder.
You may think it is light as a feather but it is much heavier than the N75. It is also a bit bigger.
I am not knocking the F80, it IS a better camera, just that it is bigger and heavier and the N75 does all one really needs in a tiny/light package.
It is just crazy that cameras this good are cheaper than a disposable one time use film camera!
The LCD grid overlay is totally worth the slight drop in luminance.