I wouldnt use fxdd either ive seen some bad things from them closing out $6k+ of positions for no reason and then no explaination/fix offered.
If you want to try Mt4 which seems to be the most flexible try interbankfx.com northfinance.com or
www.alpari-idc.com Branches. Forex with Alpari
NEVER USE fxcm.com or fxcm no dealing desk or any broker that gets you to sign an introducing broker agreement for fxcm.
DOnt use fxsol.com.
Efx and mbtrading are ok but they have limited platforms but you can through an API connect MT4 to Mbtradings servers but is more cost.
Heres a list of some ratings but dont beleive them some are from the brokers themself trying to get business.
Forex Broker Ratings & Reviews | Best Forex Broker
In reality if you use a USA broker you risk all your capital being held if they declare bankruptcy, possibly never get it back, as happened in refco situation which they still have my money.Look at Enron?
USA = most corrupt legal system in the world.
German UK and swiss brokers have diff laws on customer funds.
And YES Marketiva is more like a game even Oanda is better.