I'm going to add my .02 on the BK9 . While having a dedicated Clone may be a good thing if you have the cash and space the BK9 can cover al those bases and more. Much more than just presets you have drawbars and more programmable functions than the B3 ever had and you can midi in a second keyboard or pedals.
I've had the clones I previously mentioned and they all do a good job. As Diki said you get that and the addition of a great arranger with the BK9. Thats why I'll be selling my last clone, the VR700. Great board, good feel, very good sound and leslie sim but I am at a premium for space in my studio.
I also agree that the best clone for look, feel, sound, touch, etc, is the Hammond XK3, all 44 lbs. of it ! Adding the lower manuel and pedalboard made for it is the ultimate setup. The XK3 has real tubes in the preamp section and nothing can warm up a sound like that. Put it through a good stereo setup and WOW.
If I had the space and $$$ I would have that over a real B, and I've had a bunch.