We'll want to see all of the other elements of a major top, declining volume, breadth divergences, etc, as we reach the end of April and the next Fed meeting. I think the Valeant debt (VRX) hits the wall at the end of April as well, which could be interesting for the junk debt markets.
And then we're into May.
So I guess I'll propose a topping count ...
|SPX 60 day|
... and toss in a couple of doom charts, everything flying apart at once.