I have been using cmcmarkets, IGmarkets, and GFT. All on live accounts.
Right now my favorite is GFT purely because I can trade off micro-lots and that they also have Metatrader4 as a trading platform.
I had an alpari-uk demo account for years and still do.
So far most of the people that I know are using one of the following brokers quite happily.
IBFX, (raghee horner)
FXCM,
FXDD (greg michalowski)
oanda
GFT (boris schlossberg, kathy lien)
These are the current bigger names in the FX broker markets.
Not only that they are also supported by great currency analysts (real ones) that put out a ton of free trade and market analysis everyday.
Here’s the listing of the same brokerages and their related currency analysts:
IBFX, (raghee horner)
FXDD (greg michalowski)
GFT (boris schlossberg, kathy lien, brad gareis)
You can find information about these people on twitter and their books in amazon.
You should be fine with any of the ones above. Try not to get sucked into the brokerages that give you a lot of leverage!
Happy Trading!