The current Q50/Q70/QX70 are softer. They become more comfortable, refine and quieter but also less sporty.
I tested many Q50 RS400 with DAS and many GSF. I think GSF steering is better and should be much better than my old G35S/M35X but after over 4 months ownership I think it's not so good and my old G35S/M35X is better. (Maybe because GSF comes with electrical steering but G35S/M35X is hydraulic steering)
Q50S 3.7 is much faster than GS200t and has much much better throttle response(Nissan torquey engines).
If I were you, I would take Q50S 3.7 and put good coilovers/sway bars on it. Then I will drive it like Porsche if DAS can be as good as my old G35S/M35X. (After I own GSF for over 4 months, I truly believe I can drive my old modified G35S like Porsche
)
Maybe you should leave the boy racer civic type-r alone and race with a Porsche, see if your G35S is as fast as a Porsche. 
