It is hard describe any Jaguar XJ as a base model, so let's just say that the shorter wheelbase XJ8 is the least expensive.   Owners of the average auto might have a difficult time distinguishing this model from the most upscale Super V-8 XJ, although the two are separated by almost $30,000.  The entry level XJ8 is offered with most luxury items available in  a car, including Jaguar's "CATS" (Computer Active Technology  Suspension), soft leather seating, abundant burl walnut veneers, a moon roof, power-adjustable pedals, Bluetooth, a premium audio system, rear parking sensors, and full power accessories.
The 2007 XJs are carry-overs from the previous year, but this model has now been finished with a higher grade of leather.  Bluetooth is also new as a standard feature.
Every XJ model shares the same 4.2 liter DOHC V-8 engine, but some of the higher level models are fitted with an enhanced version.  A six speed automatic transmission is constant throughout the XJ lineup.  The V-8 delivers 300 horsepower and 310 pound-feet of torque on its own, sending the 3700 pound XJ8 from 0 to 60 mph in 6.3 seconds.  Fuel economy is very reasonable considering the power supply, at 18/27 mpg.
The sleek and dramatic XJ body stretches seventeen feet, and the standard 119.4 inch wheelbase offers plenty of leg room in the rear quarters.  However, uncomfortable front seats is one common criticism of the interior.