Agreed regarding sourcing market data from functional markets.
I've been wondering where the semi professionals have been hedging their underlying.. no single exchange has enough liquidity.
I put in an fx cfd platform once and you really need decent liquidity providers..
I have been looking at using
http://www.plus500.com/Instruments/BTCUSD rather then gox for my trading (I am Aus based). They offer a CFD linked to the gox usd price. I would like to know if anyone else is using them and what they think of the company.