This. Definitely this. Seriously, is there really a need for 30 different versions of the Skyline, Mazda Roadster(or Miata, etc), and so forth??? Look at an official carlist for GT5. The majority of the cars are Japanese. Only about 100 USA cars. I know this is game was made by Japanese developers, but a major part of the sales of the game comes from North America and Europe. It seems to me that PD needs to broaden their horizons.
Really, I'd like to see some more classic American cars, as well as modern American cars. And also more European and Australian vehicles too. There are plenty of cars from America, Europe, and Australia that are equally as good and deserving of a spot in the game as the Japanese cars they put in.
And I really don't think we need more super cars or race cars, as there are more than enough in the game in my opinion. I'd rather see more regular street and sports cars, modern and classic, from the US, Europe, Australia, etc...