The Land Rover - designed for a purpose but with a functional handsomness all of its own. Even the modern day Land Rover Ninety is instantly recognisable as a descendant of the original Series One.
I also think that, like the Mini, it is one of the few truly classless cars - you can fill one with hay and take it off across a farmers field, or drop an A list celebrity off at a film premiere in one, and it won't look out of place in either setting.