interestingly enough, a big portion of insurance and registration depends on engine displacement. K-car's you can pay a little over 100,000 for everything, and for the big fella's (the extreme opposite)anywhere between 300,000 to 400,000 (in the extreme case) give or take some.
edit: forgot to add; usually cars will be a lot cheaper if the shakken is up, but if there is still a year or so left on it, its reflected in the price. So you end up paying more or less the same price reguardless. (unless there is mechnical or cosmetic issues in which you might get a better deal), in summary its cheap to buy a car, however expensive to maintain it.