50fps vs 150fps is meaningless as far as the eye is concerned
Actually, the human eye visual threshold is at about 65 in center vision (some people have been documented as having higher, over 100), and the further you go out towards peripheral it goes up to over 120. But the reason you want the HIGHEST FPS, even well over what the eye can see. That is just the highest FPS. If your average was 50fps, that would mean in some case it drops well below that, which you will notice ALOT. And as the FPS drop below the eyes thresh it does start effecting the handling of the game.
That is just about the eye and fps. I am not commenting on getting some hardware for what game. I will not decide that till a demo, and I play it on various friends different hardware, or see if it runs good enough on my current.
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