Stodgy luxury standby Lexus is trying to trade up to the hot "prestige luxury" market with a new line of $70,000 and up automobiles.  Along with the new models comes a massive rebranding effort that aims, says a  marketing manager, to get "Louis Vuitton, Prada, Gucci and Lexus all mentioned in the same breath." 
                                    
                                    
                                
                                
                             
                            
                            
                            
                            
                            
                                
                                
                                    
                                        To pull off the image shift, the company interviewed 100 upper-crust car owners, who gave Lexus low marks on exclusivity and style. So the company, once known for its low-key wine and cheese launches, is throwing blow-out bashes to celebrate its new lines, and developing a high-performance hybrid and a 500-horsepower sports car to complement its staple sedans.