I personally use realtick and esignal as my data providers, and I also have streamer from etrade and ameritrade. Those esginal is expensive, I like having all of my stuff intergrated into one platform. If your using IB, download the plugin, and use the esignal quotes.
Quote from Tab5313:
I put Scottrade and Ameritrade streamers side by side. Yup you guessed it, they didn't agree -LAST, BID and ASK were often different.
How is that possible?