I'm in the market for a Mercury Grand Marquis, preferably on a $3K-$6k budget. Am willing to go higher if the deal appears excellent. Besides the obvious when buying a used car, what else should I look out for when reviewing this car for purchase? What are the best years for the Grand Marquis? A sampler comparison under the assumption that both cars are pretty much equal in proportionate wear that appears to be in the good to very good range: 2002 Grand Marquis LS with 57,500 miles, selling at $3,700 versus 2005 Grand Marquis GS, cloth interior, steel wheels, with 72,500 miles, selling at $4000.