Band In A Box for what Band In A Box does. Realband for what Realband does. And Reaper for the rest of it.
In my opinion Reaper is more like a $500 program for $60. Plus the added value of having Kenny Gioia as a free teacher. Any technique I've needed to do I've learning it in 10 - 15 minutes just watching his videos.
I hate to say it, but what irks me the most is that Realband does
not "do what it does." It's so horrifically dysfunctional and neglected by PG Music that it's been rendered virtually useless. Which is a real big shame-because BIAB and Realband together could be a wonderful thing. :-(