This is a zero risk, one-way bet (you're offering free money in exchange for me throwing out a number), so I guess I have to post something.

I predict the Mt. Gox trading starts at the roll-back price of around $17.5 BTC and tons of people who have lost faith in BTC over the incident attempt to sell their bitcoins at the new price (which is about $7 higher than bitcoins are currently selling for). The market will quickly self-correct, however, and within 2 hours, my prediction is that the price will be:

$12.72