All this arguing over the F20c vs. FA20 reminds me of this dyno by Gardus at Supersprint:
I don't have time to do it, but someone should calculate torque to the wheels vs. RPM. I suspect the FR-S ends up being better for daily driving (under 3500 rpm, for example), but hard to say.
The S2000 obviously kills the FR-S at the top end, especially above 7000 rpm.