For american muscle I would say I'm a fan of: 2003 Mustang Cobra, 2009 Mustang, 2008 Dodge Charger, 2009 Chevy Camaro, Dodge Viper, Chevy Corvette (08 and 09 model)
For Foreign cars: Subaru Impreza (2005 I believe..), Mitsubishi Lancer Evo (2004), Toyota AE86 (1986 Corolla hatchback), Hyundai Tiburan, Nissan Sentra (2008), Honda Civic (any of them after 2006), Mazda Miata (almost any year model), Mazda RX-7, Nissan Skyline (2007)