Use a heavy, dense, strong hardwood. Some times the pretty swirly grain stuff will break, because the growth rings are all over the place. I would use osage, bubinga, or granadillo. All are pretty, strong, and available. They also represent three different color schemes to choose from.
Personally, I would stay away from the middle weights like walnut, maple, and zebra. It all really depends on the design (degree of centerstot), and draw weight.