The Porsche Cayenne Turbo is a terrific choice, if you can afford it. Effortlessly whooshing to extra-legal speeds on request, the Cayenne Turbo is a four-wheel-driven rocket and with the powertrain's “Sport” mode engaged throttle and transmission response is instantaneous. Those who can barely afford the base Cayenne won't be disappointed by the new and improved V6 as long as outright acceleration isn't a priority. The popular Cayenne S represents a perfect middle ground, balancing the budget with the need for speed. No wonder it's the best selling model in the lineup.