I bought BIB 2011 (UltraPlusPak I think), but to be honest, I didn't spend enough time with it to make use of its great potential. I'm planning on installing it in my new machine and learn how to incorporate it into my workflow. Once you sketch out a song (which is really easy), I believe you can export those midi (not sure about audio) tracks to Sonar and mix/mangle it there.
I chose the Ultra pak as a first time user, but depends on how many realtracks, midi tracks etc...you can afford to get.