After a few days of power-shopping in South Florida’s luxury malls, Vildan and Aynur Guleryuz like nothing more than to relax in the spacious living room of their new waterfront penthouse in Palm Beach. And until they wrap up for the evening, feet propped up and cocktails in hand, their bliss involves enjoying philharmonic DVDs on their custom 70-inch rear-projection TV, or listening to Verdi’s Aida and Gounod’s Faust on their state-of-the-art audio system.