The Ndx leads and the Dow follows at turning points. My money says a bull market top is in on the Ndx. The Spx should be next to top as the market becomes more bifurcated and the rally narrows to the largest cap safety stocks.
I'm picking up hints of all is not well by reading between the lines of the data releases and news items. The market is choosing to ignore the bad stuff at this time, that's normal until the problems are recognized by more and more participants.
Short the Ndx with a mental stop at the Jan. high. Confirmation for me comes when/if the current trading range is broken at 1480 and all this recent area becomes resistance.