You may want to consider IQ Feed as a data feed with QuoteTracker. It's $20.00 a month plus exchange fees for real time intraday charting. I think CBOT MiniDow is free with IQ. If you want the entire CBOT exchange it's $35.00 for exchange fees.
With QuoteTracker, Historical data (daily charts) comes from other sources (Big Charts and Prophet). Right click on your ym intraday and choose Historical Chart, this will open up a chart from Prophet, no matter what data feed your using, it part of QT.