Hi and welcome, you must be new here.
Mtgox is slow as shit, the reason the price is higher is the market are pricing in a risk factor for trading there see this 134page thread
https://bitcointalk.org/index.php?topic=179586.0 where people are waiting 3+months with no end in sight for their money. Don't go to Gox.
Bitstamp is the best but they're currently getting smashed in volume and deposits are taking ages now too.