I want to get into film photography and go back to the roots to really learn about the techniques. Would you guys recommend the Pentax K1000 or the Nikon F, and why?
Either is fine, but: The Nikon F is heavier and bulkier, and you have to take the back off to load the film. I can think of many fine film cameras I would rather have than a Nikon F. The Olympus OM-1 or OM-2 are good cameras, and the lenses are excellent. The Leicaflex SL is also a good choice, and many superb lenses are available for it. I would take either of these systems over the Nikon F.
The K1000 is a good camera, by the way, but I would prefer the Olympus or Leicaflex systems. I own the latter.