Well, if MtGox allow withdrawal again, it will cause an arbitrage opportunity, that is known to lessen the gap between two marketplace, so the price on Mtgox will go up and it will go down on Stamp and other places.
If MtGox is insolvent, lot of people will have a doubt about the security of their investment and will withdraw cash, so the price on Stamp and other places will go down.
The only viable strategy for buying now on other places than MtGox is to hold, but why buy btc just now if you can gest them cheaper later, and you will, as soon as we'll be fixed on Mtgox fate.
So, people who are buying just now, what do you see that I don't ?