how many stocks would be reasonable to monitor with TS2i and IB in realtime?
who would you suggest if i went down the independent route, whats the costs?
You are limited to 100 symbols max on IB unless you do > $800 per month in commish. Then I think it is one more symbol for each increment of $8.
Because of the nature of the IB feed you may get fewer ticks than with some other feeds. This should not be a problem for what you are trying to do. It might even be an advantage as it puts less load on TS. It can also be an advantage in fast markets where other feeds might lag due to the high loads put on the vendors processing and comms infrastructure.
I think you should try the IB feed before spending extra money on another feed which may be no better and quite possibly worse.