Comparison: 2009 Dodge Challenger SRT8 vs 2010 Hennessey Camaro HPE550 vs 2010 Ford Shelby Mustang GT500

OptionsCustomers who shell out the cash for a Challenger SRT8 -- including the $2,100 gas-guzzler tax -- receive a car that is pretty much fully loaded. Only three options are available: a set of summer tires instead of all-season rubber for $50, a MyGig Multimedia Infotainment system with navigation for $890 and a power sunroof for $950.PowertrainAs with most SRT8 applications, the 6.1L HEMI