Style watchers are buzzing about Michael Smith, the L.A. decorator to stars, models and fund managers, who is joining the Obamas in Washington to design the family quarters. He's a surprising pick, if only because he is associated with clients like Cindy Crawford and Steven Spielberg, for whom the concept of a budget is impressionistic at best. Michelle Obama's press office praised Mr. Smith's "family-focused and affordable approach," but I doubt even he can remember when he last accepted a $100,000 limit -- that's what is earmarked for the presidential family quarters -- unless that was the budget for window...