IT WOULD SEEM TO HAVE IT ALL: four bedrooms, a guest house, a pool and a rock waterfall. But the vacation home in Naples, Fla., hasn't been drawing much interest from buyers, so the seller recently threw in that most modern of amenities: the $1 million price cut. That's brought the asking price down a full 25%. "If you want to sell, you've got to go back to '04 prices," says Chip Harris of Coldwell Banker Previews International, which is handling the property. * * * After a long string of double-digit annual price increases, a number of second-home meccas...