Good advice from Brad, but I'd pick a body that supports currently available lenses, at least partially. Get a mechanical Nikon and your lens investment won't be totally whacked when you upgrade to an AF or DSLR, assuming the new body supports the older lenses. The N80 doesn't work properly with older Nikon lenses, but the F5 does (and I think the F100 as well). Anyway, my point is to choose the camera wisely. Photographic gear is expensive and you don't want to "grow" out of it quickly.
FWIW, my Nikon N80 gives me full control when I want it. I simply rotate the dial to Manual mode, then switch the lens to manual focus and I have as much control as I would with the K1000. Or, I can switch the exposure system to manual and leave it on autofocus.
When I want to visit the past, I have an Olympus OM1 that's fully manual, made of metal, and a joy to use when I have time to do all the work myself.
Chris