The Benelli Black Eagle (and super black eagle) are getting to be a staple for serious waterfowlers. However if you want to save a few $$ for basically the same gun you can get a Franchi Intensity. Franchi is owned by Benelli and the gas system is the same on each. And if you don't want to spend too much money there ain't nothing wrong with a 3 1/2 Rem 870.
I'm going to send you a PM.