I'd get a Volt, a ZR1, 1 Camaro 2SS, 1 Camaro 1LT, a GT500, a Viper, an Aston Martin DB9, and an Audi R8.
That puts me at....roughly $600,000.
...I'd use the rest of the money to fuel them.
OH....And I'd buy 6 Prius's. One to use for shooting practice. One to burn. One to drop from a crane. One to drown. One to slide off a cliff. And one to crush into a teeny, tiny cube of cheap Japanese metal.