The only online broker with a presence in four continents and the first to be ISO certified, Advanced Currency Markets is by far one of the most reliable online forex broker.
ACM is regulated by the Swiss Federal Department of Finance and has more than $20M capitalization and a $100B monthly volume to boot. It boasts of being the first to have four trading platforms which are all user-friendly and are powered by Flash Technology which allows you to access your sessions from anywhere without having to download anything at all. You are even able to trade online via your mobile phone.
Formed in 2002, ACM is now the second largest online broker in the world. Apart from reliability and integrity, ACM provides the online investors exceptional benefits which is by far unequaled in the industry. For one, their spreads are as low as 1 pip and they charge no commission at all. And when you trade, there are no slippages or re-quotes which are quite annoying and a normal occurrence in other platforms of other online brokers. Their in house analyst is regularly featured by CNBC News for his valuable currency opinions and insights.
I have chosen ACM for my demo trading. I recomend you try it too.