A few charts on why I think the 837 area will be a wall of fire. All charts are daily ES charts.
The center of a few major moves (notice the 50% line in each of the fib measurements):

The 61.8% pullback of this last move downward:

A 180° move upwards from the March low. This is an important Gann level. Also, notice that the 90° level lines up with the 11/2008 lows, the 180+90 (270°) level lines up with the 1/2009 highs, and the 180° level lining up with a few other pivots. The fact these levels are lining up with market action tells me this is a good spot to take a measurement from.

A couple bearish signs. For Advanced Get users, we have a False Bar Stochastic setup on the daily (false bar down, stoch is over bought, Osc has returned to zero (and some)):

Every major reversal to the downside had an oscillator reading in the same general area as we are currently in. See horizontal green line and how the oscillator (green/red mountains) reaches that area at the peaks:
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