Unless you are doing primarily legacy music, I'd still go for that Kronos. You can always take the MIDI output of a BK, save as a MIDI file, then massage it to play the Kronos sounds...

And possibly take whole styles and convert them to KARMA scenes, and still noodle around live, too. So much of what makes an arranger great is the stuff that makes it easy to play live for a gig. Drop the need for that, and perhaps just the basic SOUND is a more important consideration?