This is an insane topic, because it has effectively the same answer as the question "how long is a piece of string"?
For Ahmed Ali, living in Model Town, Lahore, working as an office clerc, on a salary of Rs. 10,000 a month, with a wife and three kids...the best car in the world may be a rusty crusty old '85 FX with CNG...
For the majority of us, who can afford to dream, it's whatever we dream of. As simple as that.