Let me give my .02. The BK9 I believe was designed for the working musician more than the home player. I think it didn't sell as well as it should is because it is a Pros keyboard and most Arranger buyers are home players who want all kinds of extras. Weight, features, and price all point to that. I like mine so much I bought Bernies as a gig unit so my other could stay setup in my studio.
* Touch Screen-- do you really need it ? When I'm performing I can't be messing with making changes on a screen, hitting the wrong spot on the screen and then having the whole setup go South. Do this on my IPad all the time ! The BK9 has OTS which are easy to setup and very easy to access on the fly. Four for each Style, enough for any song. There are also Favorite sound lists for each section which again are easy to setup and use live. I've used these features playing with a band as well as a solo. As for editing there are some good free IPAd Apps which will give you touchscreen functionality
* Harmonizer - why build one in when the outboard ones are changing and improving constantly. Go simple or all out with whatever one you want. Me personally I've tried a few times to use one and its more of a distraction when playing and makes me feel more disconnected from the audience. Some use them to great effect but for the most part I haven't seen many.
* More sounds. Get the Integra 7 and your in Sound Heaven. For live work the BK9 has a good enough variety of quality sounds to go with.
The BK9 came in at a decent price and you can expand it all you want if you can find one. Add the IPAd, Harmonizer, and Integra and your still under a Genos price.