Wondering what the best long-term investment option is for your money? According to Bankrate's latest Financial Security Index survey, most Americans agree that the answer is real estate. Conducted between July 9 and 12, the survey asked 1000 adults living in the continental United States, "For money you wouldn't need for more than 10 years, which one of the following do you think would be the best way to invest it?" With 27% of respondents selecting it, real estate became the top choice for the first time in three years.