Whatever meshing software you use, you need to add Bolt to your tool chest. Bolt is a push-button solution for generating all-hex meshes from complex geometries with little or no user interaction. Most models can be meshed by simply clicking the Mesh button. For other models, use the mesh controls to adjust mesh, size, and smoothing.
http://www.csimsoft.com/boltoverview.jsp
http://www.csimsoft.com/boltoverview.jsp