Top Marques, the motor show exclusively for high performance and luxury brands, returns to Monaco's Grimaldi Forum venue this April 20-23. As well as established supercar marques like Ferrari, Lamborghini, Porsche, Bugatti, Pagani and Bentley, exhibitors include relative newcomers such as Saleen, Spyker, Mosler, Fisker Coachbuild and several of the respected tuning outfits.