Hello Dan,
when you say you have an arrangement in the works, are you using Band in a Box exclusively to "drive" the sounds, and/or another DAW, and/or NI's hardware?
I am willing to go overboard and get the whole Collector's Edition at $899 (50%) off, but am wondering if I can then simply use the sounds within BinABox (part of my workflow also includes the DAW, Mixcraft).
I am also considering getting the hardware bundle that they are offering, but rarely compose on a music keyboard.