Thanks to everyone who's replied in this thread, it's really helped. I've been reading and googling around some of the other vendors mentioned and some other threads. This is about where I ended up yesterday. I already code against interfaces for market data and order execution, so it wouldn't be that hard to switch later on if I need to. But in the mean time until there's a problem I'll try to go with the cheaper approach and minimize the amount of people I'm paying money too.
A user called Kiwi, who manages to combine the first two feeds from IB for the Sierra Chart community: https://www.sierrachart.com/SupportBoard.php?ThreadID=8341 I think Kiwi stops posting on Elite Trader years ago. I am not aware of this data feed. Maybe Kiwi is working on it now. I know nothing about this. Hence, I posted this question on Sierra Chart Support Board. Unfortunately they know nothing about it either. https://www.sierrachart.com/SupportBoard.php?ThreadID=11542#P49798
Another thing about IB's datafeed, they seem to turn it off sometime Friday afternoon and resume it Sunday afternoon. So good luck if you want to use it on the weekend or even Friday night.