So.... what will be the bottom? 

That is the 21 million dollar question. I've got a buy order waiting for the low $800s but I doubt it will go that low but here's hoping for another flash crash or two.
I don't think there will be another flash crash and then up again. It can be the beginning of a short- or mid-term bear market with lower lows. Bear markets happen and after the insane bullish last year it would be no surprise if we're heading down for some months now. Think about the scaling debate, there's no solution in sight yet.
But no, I don't see sub-500 prices coming again (at least not for a long time). The most probable outcome for me is a bottom at the 600-800 level, in about 2-3 months.