Weekahead - Wall Street eyes Greece and Fed; Main St lackadaisical

By Noel Randewich SAN FRANCISCO (Reuters) - Anxiety about Greece and uncertainty about the timing of higher U.S. interest rates may keep Wall Street on edge early next week, but one ray of hope for investors could be an unusually long streak of ambivalence on Main Street. Seen by some as a contrarian indicator of future stock market performance, a weekly poll of individual investors showed positive sentiment for stocks remained below average for the 16th straight week despite a solid uptick in o