With its new STS sedan, Cadillac promises precision craftsmanship, outstanding performance, and sophisticated luxury, all in a package it claims is "distinctly American." Based on GM's new rear-wheel-drive Sigma architecture, the STS is designed to compete with prestige sedans from around the world when it goes on sale this winter. Powered by a choice of 255-hp/3.6-liter V-6 (rear-wheel drive), or 320-hp NorthStar 4.6-liter V-8 (in both rear- and all-wheel-drive configurations) promising 0-60 mph in under 6 seconds, both engines include variable valve timing and are mated to electronically controlled five-speed automatic transmissions. Emphasizing performance and luxury, the STS benefits from keyless access with push button start, distance-sensing adaptive cruise control, Magnetic Ride Control, upscale infotainment system, sound system with six-disc cd-dvd changer and surround sound, OnStar, advanced voice recognition, and (for the gadget minded), is bluetooth ready.