Porsche has fashioned a new sports machine that comfortably seats four adults and hauls lots of luggage, but we're not referring, yet, to the Panamera Gran Turismo sedan. It won't reach showrooms until 2009, but, to the chagrin of purists who still mourn the day Porsche began building trucks, the Panamera's promised combination of performance and luxurious utility is available, right now, with the 2008 Cayenne GTS, our seat-of-the-pants choice as the best-handling SUV on the planet.