I'd choose one based on condition, now that Fs, F-pluses, and F1s seem to be selling for only $300 on average. They are an incredible bargain.
Of course I like the F2 and Norma better but still, for $300 you're getting into a system camera - they often come with extras like rails, bag bellows, fresnels, lensboards - it's pretty hard to beat. The "better" models are slightly better -- not 2-3x the price so.
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