What…not a single Nikon on your list?
Poll-like questions such as these don’t seem to be nearly as helpful as compared to, ‘here’s my criteria…what do you suggest?’ Kinda’ like the tail wagging the dog. What the gallery may deem essential may be superfluous and dead-weight in your hands.
Rather than ID’ing what I feel to be essential features I’ll point you toward some bodies worth considering so you can deduce appropriateness as it relates to your shooting. From the Nikon line: FM2n, FM3a, FE2, F2AS, F3HP. I shoot each of these bodies. Conditions and subject matter determine which body is called to duty. Nikon also offers a few (dozen) nice lenses, many of which are available for a song and no dance.