Think about it! The 2014 Range Rover Sport is probably the best choice when it comes to apocalypse. While it might not be the toughest off-roader out there, overall it's the fastest both on and off tarmac, and its luxurious and comfortable enough for any long-lasting journey. It can also seat 7 if necessary.
The only problem is the paint job, which you don't want to mess up on a car starting at $63,495. That's why I would use one of the prototypes covered in camouflage. It they could take what Land Rover engineers had thrown at them around the planet, I'm pretty sure the end of the world as we know it wouldn't brake them either. Also, they look badass!