NISSAN coupes have changed dramatically in their appearance over the years, and some would say for the worse. Those people are at pains to point out the current car's not ugly, but that Nissan's philosophy of small and sleek - did anyone say Datsun 240Z - soon changed to big, bland and bloomin' expensive. The mood has changed with the stunning soon-to-be released 200SX, but for current owners and wannabes, inspiration might have to come from within.