Bleh... I've been waiting for an 87-93 Mustang GT since GT2... 
I'd have liked to see more American stuff too, but I think it is more of a "ricer" game.  That is cool, they still have some American stuff, and Porsches, which are my second favorite car.
One curious thing I was wondering if someone could explain.  I bought a '00 Mustang Cobra... and AFTER all the HP add-ons it could only get to ~550 HP.  I then went to put a supercharger on it, except the HP before was like 3 hp higher than the HP "after".... so whats the deal?  
How can putting a supercharger on the car DROP the horsepower?  That doesn't make any sense to me.