What is the biggest forex broker with the largest liquidity

Hi guys,
what is the biggest forex broker that has the largest liquidity?

Dukascopy

Maybe something like this can give you a little bit more in therm of...everything...but it requires you to have minimum 500.000$ to open an account.

If you have a BIG wallet here are some more choices: (but Duka is one of the most liquid shops available for the 5K or less) - ECN / Prime Brokerage : ODL Prime - GFT Prime - IG Markets (UK) Level 2 Dealer / ECN For High Volume Traders : ICAP or EBS - vCap FX (institutional)

I think the largest liquidity provider in forex is Deutsche bank.

I could see that the broker less ECN spreads news is MB Trading, someone else knows as good as her?

deutshebank
barclays