EA Sigma 4.0 is the best trading forex system it si high end fully automated forex system. It places only trades with winning probability from 95% or more and adapt itself to actual trading conditions.
Your brain and your prespective about the market and what drives the market and how you read those drivers will determine your success, also you have to handle forex trading like you would any other buisness - you need to start with realistic expectations and realistic goals, you cannot just choose the system of the month and trust that its going to work, you have to incorporate relational analysis in your trading, working with close stop losses and single big trades rather than multiple smaller entries is the most stupid thing one can do, THINK BIG AND TRADE SMALL DO NOT TRADE BIG AND THINK SMALL!! Leverage your capabilities(edges) ! Do not trade on small timeframes like 5. 10. 15. Min charts becauase the price movement is completly random, rather trade on the longterm fundamental trend with longer timeframes!
I employ a scalping system using only support, resistance, trend lines, and maybe a couple fibonacci levels. That works best for me! I don't think there is any one system because everyone is different.
I did the same thing that wmorris do. That one best fitted for me after searching a lot for Holly Grail:-)