Free solutions
As you can export as OBJ format you can use the free Blender ! (Internal render or Cycles ;) http://www.blender.org/
Or as Format SKP the free Twilight 2 with free SKetchup! ;)
http://www.sketchup.com/fr/products/sketchup-make
http://twilightrender.com/index.php/what-is-twilight/hobby-vs-pro