The M9 would be very nice, but only as a present!
I'd thought of my D200 because since I got the D700 it has done next to nothing at all but sit around in a box. So, converting it to b/w seemed a sort of 'dedicated' function for it. But, perhaps that's all crazy: I still own a perfect F3. Trouble is, I gave away my processing tanks etc. and stripped the office of all its darkroom conversion kit.
But still, I can probably find another tank for films and the toilet can easily be lightproofed. I had used sheets of that silver/grey material that they use here for making curtains as protection in windows against sunlight - my wife had sewn them to size and fitted velcro to a large such sheet, and I stuck 'n' stapled the mating side of velcro onto the wooden frame of the window in the office. It was very quick and very light-light. A similar sheet on the doorway into the office and I was as blind as a bat but without radar.
But, I think I would probably prefer to use tranny material and scan, even though it is a real pain in the ass. Better still would be a 500C-type, but that would mean a hugely expensive scanner - I wouldn't use an Epson. I would also like an M film model, but digi has a way of corrupting the soul... that three-minute mind.