Insuring a Porsche 911 GT2 will set the average owner back nearly $3,000 a year just for insurance. Other high-end cars include the Mercedes S65 AMG and the Dodge Viper SRT-10. The Mazda Tribute 2WD is the least expensive with an average yearly insurance cost of $1,070 followed by the Honda Odyssey and the Mazda Tribute 4WD.