Road cars, sports cars, race cars.. Personally, I prefer race cars and spectacular oldskool ones from 60's and 70's in "Victory by Design" series. But this is just a dream. And I've realized that I have no expectations for car suggestions anymore. I'm too old for waiting and it takes too long to implementing for devs.
The more the merrier,
But if I have to be specific. I like civilian type cars, so anything far and in between a Honda R or a Skyline GTR. Everything Nissan, nothing hyundai. I'm hoping Forza volume, but would prefer quality over quantity.