Well, ever since I lost my bitcoins on gox I don't let anything on exchanges. This because if you let your coins on an exchange they are not yours, if the exchange closes you can loose everything. What I've been using recently is the BitShares decentralized exchange. I can save my assets there and everything seems to run smoothly up until now. It seems to be a nice solution, you can still trade and don't need to worry about exchanges going down. Not to mention their market pegged assets have prevented me from loosing some money on this last price drop. If you would like to try it, here is a link http://bitshares.org/ it's still something new but definitely worth checking out, it solves most problems with crypto, which is trusting exchanges and volatility