[hogFeast]

One of the best hedges has been index puts. They are the bet that no-one wants, and they get cheaper and more effective as things get crazier. Vol has gone through the roof again so I wouldn't advocate holding them but if Vix gets down to high-teens, that can be a very effective hedge. Some single-stock puts are clearly ludicrous too, I don't have the funds to put on this trade properly but there are tons of stocks out there that are clearly going to collapse if things get dicey. And there are quite a few unfashionable companies on mid single digit P/E that are going to do well in that scenario too (which I do own).

For diversification, I would try to diversify geographically if you want to retain a 100% equities allocation. US is overvalued, lots of markets outside the US are cheap.