I like my Benelli SuperNova Tactical also - I added a mag tube extension and the Mesa Tactical sidesaddle (6 - 8 gets in the way, according to MT). I also added the MT QD sling mount (designed for the 870?) - it works well enough for me. Comes with ghost ring sights, the MT side saddle adds the rail up top, I really prefer the pistol grip on a shotgun, cycles well, takes down easily. I got mine NIB for $369 otd...3-4 years ago.
I have nothing bad to write about the several other popular models listed in previous posts. I just haven't had enough experience with them to write anything at all. I do like that they are probably around the US in significantly greater numbers than the Benelli. Plus, I'm not so hot on Benelli's refusal to export the collapsible stock for the M4...but that's life.
I also have a Benelli Nova pump - just a bare-bones sg there - like that pretty well - it handles well, is easy to take down and clean, solid construction, nice features for a base sg - by no means a tacticool sg, though.
Madness is like gravity; all it needs is a little push.