Directional Bias For The Day: S&P Futures are lower at 8:30 AM; The odds are for a down day with elevated volatility – watch for a break above 4408.25 Key economic data report due during the day: HPI ( 1.5% est.; prev. 1.6% ) at 9:00 AM S&P/CS Composite-20 HPI ( 20.1% est.; prev. 19.1%…