Backtesting and Market Replay

Hi Guys,

I am in the process of developing an automated strategy and am at the stage where I would like to test different variables across different markets over an extended period of time.

Basically, I want to test a range of futures markets efficiently and accurately as possible.

I have been told that I should follow this process:

Backtest > Market Replay > Live Sim > Live.

Sounds logical to me, however, I am not sure which data I should be using. I guess I would have to use a continuous contract? Does anyone know where I can get the most accurate back-testing and market replay data for Ninjatrader?

Does anyone have any experience with the following vendors?

http://www.backtestdata.com/
http://www.marketreplaydata.com/
http://marketreplay.net/

Much appreciated.
 
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