Like said above, you have a ton of options and really can't go wrong with any of them.
I use a Rem 870 with full choke tube, but have also used a full choke NEF pardner with good results.
If I were looking to buy new, the only thing I'd be sure to get is a thumbhole stock. When I think of most of my turkey experiences, that would really have helped hold/point/shoot when that tom is close and no movement is soo critical