I appreciate all the responses, and am actually leaning towards getting the Everything pack now. Although I've been using BIAB since version 2.0 for DOS, it's gotten so sophisticated that I know I'm missing out on quite a few features.

I generally use it as a rough sketchpad, then transfer the tracks to Sonar and record over what BIAB did with real instruments (usually playing different things than what was generated.) But it would be interesting to really see what BIAB can do when used to full potential.

again, thanks for all the responses.