Osburn wood insert choice and type of chimney liner questions

I honestly dont know the osburn so i cant comment on that. But as far as liners go i feel that the 2ply stuff is the worst liner available on the market right now. It is very easy to damage when installing or cleaning. What we use for wood stoves is heavy wall flex liner. But i would recommend regular light wall over the 2ply stuff any day. You also should insulate what ever liner you choose and install a block off plate

For certified installers in your area go to:
www.csia.org
www.ncsg.org

Type in your zip code and you will get a large list of certified sweeps in your area. Ask them if they do installations. I'm sure many will say they do. Agreed on your choice of the Osburn. By all reports they are very solid stoves and good heaters.