Analysts have great expectations for these stocks.Federal Reserve Chair Jerome Powell says stocks are "fairly highly valued." Warren Buffett almost certainly agrees. The valuation metric that bears his name, the Buffett indicator, which measures U.S. total stock market capitalization to gross domestic product (GDP), is at an all-time high, indicating such. But can stocks still go higher? Absolutely. Some hold the potential to deliver especially explosive gains. Here are three stocks to buy in October that c ...