I wasn't comparing the 911 Turbo to the G35. Nissan goal for the GT-R is the 911 Turbo performance range. The GT-R is to G35 is like the 911 Turbo is to the 911 Carrera.
I know the GT-R is around the Cost of the Corvette in Yen, but you gotta remember, the R34 only has 280 hp. While they're aiming the GT-R @ 400hp. So for 400Hp, you can pay $116k for the 911 turbo, or you can get the $70k GT-R. I think that's Nissan's goal w/ the GT-R. That's all I'm saying.
If you think the Porsche pricing is not a good comparison, then how about the 325i for around $30k and the M3 for around $50k. For an addition .8L and 100+HP, you're paying an additional $20k. I can go on an on. My point is that for one of the best AWD system available and an additional 120 HP, i think an additional $30k is a fair price to ask.