Best cars for Mega-Millionaires

Buying a supercar with your millions may seem cliche, but not if you're the only one that owns it. The Zenvo ST1 is made in Denmark, has a 1,250 hp engine, and a price tag of $1.8 million. Best of all, only three of them are being made for the United States. Pick up the trio and you'll corner the market and still have a nice chunk of change left over for a  few dozen <a href="http://www.foxnews.com/leisure/2011/10/06/review-2012-lamborghini-aventador-lp-700-4/">Lamborghini Aventadors</a> and <a href="http://www.foxnews.com/leisure/2010/12/22/review-ferrari-italia/">Ferrari 458 Italias</a> to hand out as party favors. <a href="http://www.foxnews.com/leisure/2011/11/22/test-ride-18-million-zenvo-st1/"><b>Read more about the Zenvo ST1</b></a> (Zenvo)

It is considered by many to be the most beautiful car ever made, and also garnered the highest price ever paid for an automobile when one was sold to the Mullin Automotive Museum in 2010 for between $30 and $40 million. Only two are still in existence and Ralph Lauren owns the other one. He doesn't need the money, but everything does have its price. (Gooding and Company)

After your face is splashed across TV screens around the world, you're going to have a rather large dollar sign-shaped target on your forehead for the rest of your life, so you'd better be prepared for the worst. The Knight XV is a $300,000 armored all-terrain vehicle with bulletproof glass, night vision cameras, its own air supply, satellite TV and a refreshment bar for waiting out your assailants. <a href="http://www.foxnews.com/leisure/2011/05/18/best-car-survive-zombie-apocalypse/"><b>Read more about the best car to survive a zombie apocalypse</b></a> (Conquest Vehicles)

Half a billion dollars seems like a lot now, but as reality TV has shown, riches often lead to rags. Why not follow the example of the world's most frugal billionaire, Warren Buffet, and limit your splurge to a $45,000 Caddy like he did when he picked up a DTS in 2006. Hey, it'll do the speed limit just as easily as that Zenvo will. (Cadillac)