I bought at 800 when it had stabilized there for a while late November (and was pretty happy when it went over 1100) and then bought at 725 as it was falling from 1000 after China closed up shop.  There was a little bump in the drop and that's where I bought, figuring it was going back up and a 25% drop was all that was likely to happen.  Well.... not exactly.  I wanted to buy more when it hit 500, but I'm not made of money, and my wife said we'd spent enough already, heh.