* Broad index ends at highest since before Lehman collapse * S&P 500 inches toward 1,370 * Consumer sentiment rises more than expected in Feb * Dow flat, S&P up 0.17 pct, Nasdaq up 0.33 pct * For up-to-the-minute market news, see By Rodrigo Campos NEW YORK, Feb 24 (Reuters) - The S&P 500 rose on Friday to close at the highest level since before the collapse of Lehman Brothers in 2008, continuing a pattern of steady gains on signs of U.S. economic recovery. The b