It is important to remember that the mtgox btc valuation is artificially high because of them being blacklisted by as much of the fiat banking system the USG can influence. So, transferring the btc to another exchange and selling it is only realizing what the btc are really worth.

The best option to get fiat is to buy btc on mtgox and sell on localbitcoins where the prices are good, or, if in a hurry, sell on bitstamp instead.