Yes, the stock market is overheated judging by all valuation metrics.
For those of us who don't want to jump the gun and want to stay in the trend until it is broken, sector ETFs offer better return than major indexes such as S&P 500 and NASDAQ, but are not as volatile as individual stocks.
According to Goldman Sach, IT and consumer discretionary have risk adjusted return (Sharpe ratio) of 0.9.