It really depends on the thickness and the stiffness of the individual piece of wood.
I've set up and played basses with maple boards that played really well and sounded great walnut and cherry too, for that matter.
A new ebony board will run you at least six or seven hundred bucks, depending on your location, and you'll probably need nut work too to make it match.
I'd say use up what you've got first but that's only my opinion.
