I was never a Nikon fan in the 1970's I'd so I went down the Pentax route, but I did like the FM but I'd committed by then to a system.

Looking from the perspective of starting new with a film camera system I think of all the cameras listed I'd go for the Nikon FM2 or FM3 or perhaps the Pentax LX simply becuase these lens mounts are sill in use although with added functionality. That means lens bought for these cameras could be used on DSLRs from the same manufacturer if you wanted.