wow this whole thread sounds like the typical "WRX vs STI is it worth it"
At least between those 2 you get a bullet proof 6 spd tranny, Brembo brakes, suspension bits, way better wheels/tires, more differentials, bigger turbo and I still thought the STI wasn't worth the extra $7k.
Now knowing that the Nismo mostly gets a body kit with a small HP increase -that any exhaust can give you- and a stiff ride that most people seem to complain about I don't see myself ever even considering the Nismo.
just my opinion