How is a reasonable number of polys of an import obj file?

Try with these 2 ones separated from ZBrush with no result ;)

_importObj works fine
_subdiv_beta open for gear but...

http://moiscript.weebly.com/uploads/3/9/3/8/3938813/pm3d_dog_1.obj quadrangles 8 000
http://moiscript.weebly.com/uploads/3/9/3/8/3938813/pm3d_gear3d.obj triangles 3 300