if you don't want to go bank for funding/withdrawal issues... use a broker with local depositor option.

no broker is perfect... at least find a regulated one.

AFAIK, information about the liquidity providers is confidential.

But, we as trader don't have too much option. Anyway we still need to trade, thus in your case, you should find a best one.
Since you targeting >50K USD monthly basis, why don't you go for Dukascopy ? 

P/S No offence. But, InstaFX is way behind other brokers including bucketshop one. (In terms of marketing strategy, spread, customer service, registration system)