Hi Don,
I liked the BK-7M. The ONLY reason I sold it was because it did not allow users to change the OTS voices and save them. Had it allowed those changes I would have kept it. When I called Roland support they did not have any indication that any software updates were in the near future so off it went.
I am not sure I am going to be a buyer for any more $4000.00 keyboards. Right now I am very happy with my Tyros 4 and will probably keep it well beyond it's useful life. Until other manufactures develop a multitude of additional styles I will stay with Yamaha. For me that is the most important feature - availability of "free" styles.
I have tried Korgs in the past, both the PA1X and the PA2X Pro and did like the styles. Had Korg developed the support for styles that Yamaha enjoys I would have kept both of the Korgs. I believe all the TOTL arrangers are pretty good - but whichever arranger you buy it has to fit into your gigging requirements and for the working pro that is the "ONLY" thing that matters.
Deane