It (the XK-1) has probably held its value fairly well... the kids are bigtime into the Nords and other clonewheels.

Maybe if you get a chance to audition the BK-9, sell the BK-5 AND the XK-1 and that should put you into a BK-9 fairly easily...
_________________________
An arranger is just a tool. What matters is what you build with it..!