Hi John,
TradeStation is the market leader and the 'standard' backtesting package. It depends on which instruments you are interested in but I believe they hold over 10 years of 1 min data for US stocks and futures and 30 days of tick data. It costs between $100 and $200 per month (+ exchange fees) depending on what options you choose. I don't know you mean by 'best' data. It seems reliable and OK to me.
Cheers
Martin
TradeStation is the market leader and the 'standard' backtesting package. It depends on which instruments you are interested in but I believe they hold over 10 years of 1 min data for US stocks and futures and 30 days of tick data. It costs between $100 and $200 per month (+ exchange fees) depending on what options you choose. I don't know you mean by 'best' data. It seems reliable and OK to me.
Cheers
Martin