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$SPX Daily Chart 

Very interesting chart now. 1900 has become critical short term support for SPX. A break below that level, and I believe we quickly go to 1600, as shown. 1600 is a very interesting level, and will likely yield support for 3 reasons. The long term breakout from the trendline connecting the 2000 and 2007 highs comes into play at 1600. On a plunge next week, we should find support here, A failed breakout of that line would yield a much larger decline, which I think we'll have to wait for a bounce before seeing that. Second, coming off the Nov '12 low to the '14 high, 1600 would be a 61.8% fib retrace. Also, with the red trendline shown, which is coming of the "taper tantrum" lows, we have broken that line, and a full retrace of that move would take us near 1600. Finally, the long term MACD trendline was broken this week, circled at the bottom in green. This would be indicative of more weakness straight ahead.