drewbarb
picnic like it's 1999
It's hard to go wrong with any of these choices. I would try to handle and shoot a bit with good examples of each of these cameras. The shutter speed selector ring around the lens mount is indeed a very handy feature on the Olympus. (I love this feature on my old Nikkormat.) But the higher shutter speeds of the FM2n are incrediblely useful to have, too. There are possibly more lenses out there available in the Nikon mount than the Olympus or Pentax mounts- but the Olympus or Pentax mount lenses might be cheaper, generally speaking. Another toss up.
Bottom line is that a good, solidly built, small SLR is perhaps the most versatile and ultimately the most useful 35mm camera available. ( I can feel the flames from here!) I'd take a look at the availability of lenses you might want or need in the future, find a good deal, and pull the trigger. If later on down the road you decide to really need to change systems for any reason, you should be able to sell what you have and buy the other system without losing much money. I wouldn't worry about it. Online forums will yield thousands of conflicting opinions, and little definitive answers, so just pick one that seems to make sense, and shoot with it. Less time here and more time shooting, processing, and printing will be the best thing for you- and probably all of the rest us, too.
Bottom line is that a good, solidly built, small SLR is perhaps the most versatile and ultimately the most useful 35mm camera available. ( I can feel the flames from here!) I'd take a look at the availability of lenses you might want or need in the future, find a good deal, and pull the trigger. If later on down the road you decide to really need to change systems for any reason, you should be able to sell what you have and buy the other system without losing much money. I wouldn't worry about it. Online forums will yield thousands of conflicting opinions, and little definitive answers, so just pick one that seems to make sense, and shoot with it. Less time here and more time shooting, processing, and printing will be the best thing for you- and probably all of the rest us, too.