Ok, this risks degenerating into a nerdfest of titanic proportions, but how about:
Rationalists (Spinoza, Leibniz): Porsche, BMW, basically anything German except a bubble car
Empiricists (Locke, Hume): Morgan, other brits and italians from back in the day
Kant (Critique of Pure Reason, somewhere in the middle ground): Volvo P1800, Citroen DS
Now I'm going to adjust my glasses and head back to the library to finish my homework :-).
