I'd suggest trying the demos for Silo orMax. Also look at the learning editions of XSI, Maya and Lightwave. Not one person here can really tell you what's best for you, as everyone has their own taste in workflow. If you decide you don't need all the features of those higher end apps or if Silo doesn't cut it for you, try WINGS3D, or Blender. Both are great programs for new Users.