There's no way you can get enough variation in a poll like this to count all people's wants in terms of new cars.
I mean I could say Ford and Chevy and Dodge, but I'd mean 60s and 70s muscle cars, not modern ones (except the Viper, I'd have that).
I'm not sure how many poll options you get, but you could split it into Euro, Asia, US and Japan, then combine manufacturers, then generations and models. As you can see it'd take too much time. The "cars in S3" sticky is far more comprehensive.