Are you referring to the interbank market here when speaking about wholesale dealers or is there a difference? Because at the end of the day, in a true ECN model the interbank market is where the trades are sent I think (which I referred to as the real market earlier in this thread). I am asking because up to now I am not sure whether the banks taking the trades is basically the same situation as with a market maker broker.
Have a look into LMAX. They do charge commission and have very competitive spreads. They pride themselves on execution!
However like quatron mentioned - one must understand the complexity of the FX market. It is extremely manipulated and unless you understand this I wouldn't go near it. Once you understand the manipulation going on you are well on your way to freedom lol