I think an easier route to take would be to make a prioritization grid for the data feeds that the user sets up. I say grid because some feeds you want to be a priority for futures, but another one for forex. It would look something like this
Stocks / Options / Futures / Forex
1. IQFeed / ????? / ZenFire / Gain
2. Yahoo / ????? / IQFeed / ?????
3.
4.
5.

Comment