Here are a few points which I consider that must have in a reliable Forex Broker.
Live training, with one-on-one help
Personal account management
Start trading in less than 5 minutes
Start trading with as little as US$25
Credit Card or PayPal use for instant Deposit
Guaranteed
Stop-Loss Rate
Freeze the Rate you see (Freeze&Trade)
No hidden costs, Competitive spreads
Special Terms for frequent traders
No download to software
Live Quotes, real-time
Full Transparency
Security and Safety