I would seriously consider the F3HP as a good all round camera, regardless whether it is your main camera, or secondary camera.
With the HP finder it is excellent, put in the type "E" focusing screen with the horizontal and vertical reference lines and you have a screen that can use any Nikkor lens, no matter how small the f stop of the lens is. The type "B" focusing screen is the same as the "E" except it doesn't have the lines. Both of these screens are the only ones which are suitable for any Nikkor lens, including the f/11 1200 nikkor, which I once had one of my F3's attached to for a roll of film.
The excellent DW-3 waist level finder is fantastic for overhead shops using a 24mm lens and the camera held at arms length above one's head.
The DW-4 6X magnification finder is an absolute eye opener for focusing on fiddly stuff. One of the more exotic uses for this finder, is for close focusing the 105 f/2.5 lens.
It works like this:- Place the camera in portrait mode, on it's side. One then focuses critically on an eye or part of an eye, or wherever, as soon as critical focus is reached you squeeze the shutter button. This ensures accurate critical focus with very interesting out of focus parts of your scene. The 85 f/1.4 doesn't work as well, however the 180 ED f/2.8 is also a good prospect for this close focusing. It at first is a bit funny standing on the side of the tripod for focusing, but like backwards pictures on the focusing screen, one soon comes to grips with this.
I also have the DA-2 Action, or sports finder. This is terrific for focusing whilst wearing a motorcycle helmet or working in very cold weather and you are wearing a hooded jacket with draw strings and possibly goggles so your eyes don't water in the super cold wind. You can focus perfectly with the camera between 100 to 250mm away from your eyes.
The F3 also has an advantage over most cameras manufactured after it. It doesn't have a permanently attached drive! With the F3 I put the body in one jacket pocket, in the other pocket I carry a lens. Yes they are weighty, but they travel exceptionally well when transported in a broken down form.
The F3 was Nikon's third major model and more or less by this time, they had perfected the camera body. With the almost endless array of accessories, you can photograph virtually anything.
The absolute quality that went into the manufacturing of this particular mass produced manual focus camera, has not been equalled either before or after.
At least that is my view after using this camera for over 23 years, whilst slowly acquiring little bits and pieces which have enhanced it's capabilities enormously
Mick.