The standard XJ8 ($63,585) is powered by the 300-hp, normally aspirated V8, and it's comprehensively equipped. Standard features include heated front and rear seats, Bluetooth cell-phone interface and Xenon headlights with power washers, which are often options, even in the full-size luxury class. The standard leather seats have contrasting piping. The 140-watt audio system features eight speakers and a single-CD player, and 18-inch wheels come standard.

The XJ8 L ($67,085) is equipped like the XJ8, but its wheelbase is five inches longer, which means considerably more legroom in the back seat. It also comes with an electric rear sunblind.

The long-wheelbase Vanden Plas ($74,835) is the quintessential luxury Jaguar, adding British niceties such as a twin-stitched leather dashboard, Peruvian boxwood inlays in the standard burl walnut trim, rear-seat picnic trays and deep-pile lamb's wool rugs. It comes standard with a DVD-based navigation system and a 320-watt Alpine stereo with 12 speakers and a six-CD changer.

The XJR ($79,930) is the high-performance model, built on the short wheelbase and powered by the 400-hp, supercharged version of the V8. The XJR also gets a firmer suspension with steel springs, rather than air springs, larger Brembo brakes, 19-inch Sabre alloys wheels with Z-rated performance tires, R Performance sport seats and special trim inside and out. It comes with the Alpine audio and Jaguar's touch-screen navigation system.

The Super V8 ($91,335) is the luxo-hotrod of the line, or the long-wheelbase Vanden Plas with the 400-hp V8 and Brembo brakes. It also features four-zone climate control, adjustable rear-seats and a DVD-based rear seat entertainment system with two 6.5-inch display screens.

Options are few, given the level of standard equipment. A Warm Climate Package ($1,350) includes four-zone climate control and rear sunblinds. The Multimedia Package ($2,950), touch-screen navigation ($2,300) and Alpine audio ($1,600) are offered for models that do not include them. Single options include Front Park Control ($250), Sirius Satellite Radio hardware ($450) and a range of special wheels ($1,200-$4.500)

The XJ's standard safety features match the class baseline: dual front airbags, front occupant side-impact airbags, curtain-style head protection airbags front and rear, advanced four-channel anti-lock brakes (ABS) and electronic stability control. Some other full-size luxury sedans offer driver's knee airbags and rear side-impact airbags.

The XJ's tire-pressure monitor, however, is one of the most sophisticated available, measuring absolute pressure in each tire. Most systems rely on the ABS system to measure tire pressure, which means they measure each tire relative to the other. Theoretically, if all four tire loose pressure at the same rate, the system might not report a pressure loss.