There have been a myriad of engines sold with the Cayenne. The 3.6 liter Volkswagen V6 is the only non-V8 engine. The Cayenne S gets a 385 hp V8, the Cayenne GTS gets a 405 hp V8, the Cayenne Turbo gets a twin-turbocharged 500 hp V8, and the Turbo S gets a 521 horsepower V8. The Cayenne Turbo S will be discontinued soon.
The Cayenne is perhaps the top performance SUV. The turbocharged models have performance numbers similar to the Boxster S, with a 0 to 60 mph time of about 5.2 seconds.
The Cayenne is not just a straight-line vehicle, despite the fact that it's an SUV. It handles about as well as any SUV ever made, and it has better off-road capabilities than any other luxury SUV.
Porsche has sold over 100,000 Cayennes in the United States, making it one of the top-selling Porsches of all time. You can buy them just about anywhere. Check prices on eBay, or just buy from eBay. There are probably at least 10 listings on there right now.