Blue Beetle. But then you know my taste for car design so I'm betting this isn't a shock. :-)
I had Batwranglers experience with a string of undiagnosable problems and cascading repairs with a purchased-brand-new Buick once upon a time. It was truly the Demon Seed of vehicles. Even the mechanic was impressed with how horrible it was despite meticulous maintenance... and he advised me to dump it. It's pretty bad when your mechanic urges you to get rid of what is, for him, a cash cow. :-D My Beetle-owning friends love their cars. So far I know three... all three happy campers.