Just Broke $300 at Bitfinex but it is not stable so far, Actually I would rather take the Bitstamp as the standard price, Chinese exchange are following this exchange too.
Bitstmap breaks the $300, that is the only way I will say we broke $300 today.
However one looks at it, Bitstamp is fading. Bitfinex has over five times the volume now. Coinbase is bigger too. The standard price should be where the majority of trades take place.