I gotta tell you John, I wouldn't worry too much about the exact material for the ore. Frankly I don't think it matters that much, if at all.
Maple, elm, walnut, action-boo, action-wood, .... heck even oak, hickory, black locust, cherry, OSAGE .... people even use IPE! (which I think is insanity)
It all will work. I'd try to go lighter density like walnut, but realistically, anything which is lighter than osage (which includes everything on that list except ipe; as well as every other north american hardwood) you're goign to probably see a little better speed over solid osage.
Personally I'd just use whatever is going to give you a nice look with the hickory and osage....