...Tim Curry, just to see what he would bring to the role. He can be very suave and debonaire when he wants to be, looks good in a suit, and can also be very imperialistic. Ideally though, Christopher Lee or Alan Rickman (yes, I know they're dead, but I would still vote for them over any of the above).
Worst case scenario, you rope in Mark Strong or Colin Firth, or have Taron Egerton play a very young Bond.