It is no secret that stock valuations, especially among large-cap stocks, are running hot. After a bull market that's run for more than three years, with the S&P 500 returning 23%, 24%, and 16%, respectively, in the last three calendar years, valuations were bound to rise. But they have reached historically high levels, at least according to one key valuation metric, the Shiller P/E ratio, also known as the cyclically adjusted P/E (CAPE) ratio. Where to invest $1,000 right now? Our analyst team just reve ...