Be wary for Bitstamp price. It is much higher than the other functioning exchanges now. If Gox finds all the bitcoins and withdrawals are resumed, they will be sold in other exchanges (bitstamp being the only one with fiat withdraw option) with massive damage to bitcoin price.
I don't think Gox is going to "find all the coins". At least I think it is likely they lost quite a bit. That plus the seizure of their bank account and regulatory problems means they might have to replace rather than find, both coins AND USD.
I think the Mt Gox price reflects the overall sentiment that they may be insolvent... I don't think the arbitrage will last very long if it turns out they are not.
This is a rare opportunity, but the trick is divining what the actual opportunity is.