EDIT #2: Captain of the Beige Wonder, Coty, MarquetteLa, and Camshaft Chris have all guessed correctly! My first GT6 car review will be of the 2008 Nissan 370Z/Fairlady Z! Stay tuned for that later this week, most likely tomorrow.
EDIT: Since it's been about an hour and a half and no one's guessed it yet, I will add that it is a Nissan, and that it is relatively new, this car.
I'll give you some hints: it's Japanese, it's a coupe, and while it does have a sporty character to it, it's not exactly what I'd call "fast." So, what could it be?