One of the 547 Buick GNX muscle cars that GM built in 1987 has been listed for sale by a Las Vegas dealer. Cleverly described by C&D in its days as "Darth Vader's Ride", the GNX is a rare gem, even more so if it has a mere 5,000 miles on the odometer like this example that's priced at US$95,000.When it came out in 1987, which was the only year it was offered for sale, the Buick GNX was the