As per the title, what price is likely to have you getting a little sweat on?
For me I'd be a little disappointed with $400, mildly aggrieved with $300 and my shitty moment would be somewhere just below $200.
I really thought about this ... and my answer is either:
1. $0 -- Oh shit, they figured out something so terribly wrong that we can't even roll back to some earlier version (the probability of this is so negligible that I don't even worry about it)
2. $10,000 -- Oh shit, we didn't innovate technologies using the Blockchain fast enough and hyperinflation is here now (judging by how fast things are moving ... ethereum, bitcongress, NXT, Mastercoin, ColoredCoin, OpenTransactions, BitMessage, Protoshares and so much else)... I'm getting less worried about this option as well.