Think about this. The 420-horsepower 2006 Jeep Grand Cherokee SRT-8 produces almost as much power as a Porsche Cayenne Turbo for virtually half the cost. Plus, Jeep claims that the SRT-8 can accelerate to 60 mph faster than the top Cayenne, at less than five seconds. In fact, for this hot-rodded Jeep’s base price, you can’t even touch a base 247-horsepower Cayenne V6 with a manual transmission. And the Jeep is clearly the more attractive vehicle. So what, exactly, would you pay a premium for with the Porsche?