Hey there, I have owned a V35 Coupe 6 Speed and a 350gt8 Sedan in the last 18 months.
The Coupe is great fun to drive, the back seats do fold down enough room to get golf clubs and a buggy in there, they are a great smooth car on the road, mine had after Nismo twin pipes and ad a geat sound to it. I got it when it had done only 10Kms on the clock it was a pleasure to drive and the power went striaht to the wheel, it has the traction control that was very usefula and savend me alot on tyres! I would say to be honest with you as I drive hard I had to replace the clutch at 25kms but apart from that the car was rock solid.
I really like the sedan 350 GT8 because it was more relaxed to drive but the 8 speed gear box was really fun and to be honest it felt quicker than the coupe. The coupe had Brembos all the way around, you felt like you could stop 2 m before a corner when you wer tapped out in 3 gear that fun, sometimes I felt like the seat belt would brake I was driving that fast! lOL
In Summing up the 350GT8 was a more practical everyday driver with plently of power , the coupe was fun to drive and it looked the part too.
I am told that there is a twin turbo kit that can be fitted if you wished for a price of approx $4500. I have been told if you get a full exhaust system put on them they rev that fast and hard it feels like it has a turbo anyways.
Good luck.