In-game footage of Bugbear Entertainment's Next Car Game (now known as Wreckfest). Currently in pre-alpha, this game evokes the spirit of the Destruction Derby games from the late 1990's. The visuals are stunning, the physics engine is doing some amazing things, and it's generally just damn good fun.
The pre-order alpha can be bought and downloaded from http://www.nextcargame.com
There's also a free sandbox playtest that you can try if you want to be sure your PC can handle it.