So if I understand correctly Bitstamp is now the only valid exchange left?
BitFinex has been working well, but that's basically Bitstamp + a few more coins in liquidity. 
There's uhhh... BTCChina? I think they still operate in some capacity. I think Kraken might still be going with its 2BTC daily trade volume. There's uhhh....... uhhh..... I think that may actually be it, but person-to-person exchange is booming, which is fantastic. Trouble is they generally rely on centralized exchanges to determine price to use.