Poised at the top of the lineup is the best 2006 Buick Lucerne available, the CXS. Priced at $35,990 (including a $725 destination charge), the CXS comes standard with all the equipment on the CX and CXL plus a V8 engine, multiple memory functions, power lumbar for the driver and front passenger, fog lights, an automatic tilt-away steering wheel, perforated leather seats, a 280-watt Harmon Kardon audio system, and XM satellite radio. Buyers wanting more can add heated and cooled seats, chrome alloy wheels, a power sunroof, and other goodies. But what really adds value to the CXS is its standard StabiliTrak system, electronic brake assistance, and magnetic steering and suspension systems. In combination, these technological tweaks transform a rather generic domestic sedan into a responsive machine that’s actually fun to drive.