Well, I sprung for the F100
Thanks to all of you for your experienced and illuminating replies to my original thread. In the end, the F5 offered no real advantage to me other than its build quality; the F6 is 'way too much money; the F3 and all other F manual focusing Nikon cameras are too slow. I really need fast and accurate autofocus because I'm shooting mostly wide-open. I just bought a used F100 from eBay (with the right to return it for a refund) and I couldn't be more pleased. The seller, a professional portrait photographer, said this was his backup body and it had seen less than 100 rolls go through it. He switched to digital for his portraits, so he threw in 46 rolls of various 35mm Pro films. I tested the F100 with my 20mm f/2.8AF-D Nikkor wide open at night on the streets in NYC with HP5+ in D-76 and the results are quite satisfactory. The focusing speed is almost instantaneous and the exposures are excellent, even under tough street lighting. I set the camera on aperture priority and shot wide open, not paying any attention to the shutter speed. My guess is that most of the shots were between 1/8 and 1/60. The shutter release is very smooth and the noise level isn't too bad, but it is a bit louder than my N80. I also brought along the N80 with MB16 grip fitted with my 20mm/3.5 AI Nikkor, loaded with Provia 100F, but the light levels were too low to shoot. Now I have both bodies in which I use nothing but AA batteries, and even a built-in pea-shooting flash for emergencies on the N80. That's why I'm keeping both bodies. I also have original F's and F2's in the Nikon stable, but they don't get used very often, except for copy work, when 100%viewing accuracy is required and the removeable prisms come in handy.
Oh, I almost forgot...I also still have my Bessa L with the 15mm Heliar for shooting from the hip. Please excuse me for now, I still have 45 rolls of film left to shoot.