What is the best source for real time options data?

Looking for a good source for real time volume and volatility data with a good charting package. Have used Interactive Brokers historically and was for the most part pleased, but their offering leaves some things to be desired and I wondered if other traders had better luck with other data providers.
 
Thanks for this guys. Does Thinkorswim's package have some kind of "heatseeker"-type function that tracks volume and volatility gainers?
 
Quote from jeangenie:

Thanks for this guys. Does Thinkorswim's package have some kind of "heatseeker"-type function that tracks volume and volatility gainers?

Yes.
 
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