Mark

I think you'll love the BK9. Buy one from a dealer who will give you a 30 day return option and try it out. It does take a lot of time to get it to where you personally like it but from the get go the drums and bass on the arrangements will impress you. You can hit the track mute button with any style and just play piano with the drum/bass backrounds and sound great.
What have you got to lose except some time, give it a try.