Oh, I found another turkey out there. The Mossberg 500 Grand Slam Turkey Series. It comes with an X-Factor Ported Tube, which I think means it is ready for other choke tubes as well. 20". Also has front and rear sights ... sounds versatile.
(This suggestion comes with the caveat that the gun looks sort of like, if you were to plant it in some nice topsoil and water it now and again, it would turn into a jungle.)