I have shot both my FM3a and F2-AS without batteries and gotten great results mentally calculating exposure. Its really not that hard and print film is pretty forgiving if your a stop off. For the features you were looking for, I would advise any variant of the F2. They can be found a lot cheaper than the FM3a and generally are in user condition so you wouldnt feel bad about adding a mark or two getting on it as you are shooting. The F2 really is IMO the finest example of mechanical SLR cameras. It feels like a fine swiss watch. Shooting with mine is a complete joy and I find myself using it 60% of the time more than my FM3a simply for the way it feels in my hand. Oh and it features 100% view finder also which is nice.