In an era of fiscal crisis at most American orchestras, the San Diego Symphony has had the unusual luxury of sitting back and waiting to find the perfect person to lead them in a time of newfound wealth. The orchestra received an unexpected and unprecedented $120 million gift last year, and now they may have scored something of a coup in the baton-waving department, reaching an agreement with Jahja Ling to be the orchestra’s next music director. Ling is the director of the Cleveland Orchestra’s summer festival, and a former music director of the Florida Orchestra. San Diego had previously offered the position to up-and-comer David Robertson, who declined the job.