I'll only short IMP when it's near R180 again, and IMS when it goes above R500, and only if the reasons seem temporary or backward-looking. Below those figures, it's a 50-50. Above you can still lose on mad rallies, but it's easier to catch. I prefer AMS because it seems to be considered in far more trouble than IMP - management, predicted earnings, debt, so rising prices are to be trusted less, IMHO. If people are betting that either cars or jewelery are going to pull the price up, they're dreaming. Chinese car purchases are temporary, helped by govt subsidies. U.S., Europe, etc need a while to sort out their car markets.
The only things I can think of to buy, are because sooner or later the car markets will improve, and the US$ is going to turn to junk so investors should get out of it into anything else. Gold is flaky, so rather get platinum. Maybe the improving debt markets will help. But I reckon a few forgotten issues are going to raise their heads again.