I prefer the 870 of the choices given.
The 500 is a decent gun the 590 is a very good gun the 870 is still the standard.
The Benneli M4 is arguably the best fighting shotgun manufactured to date.
There are other good choices but most aren't supported well by their manufacturers or the after market.
The appearance of the shotgun does not effect its lethality in any way,
Im am still going to hold Judgment on the 887 anything over 3" chamber makes no sense to me in an HD or fighting gun so I'm still struggling with the why of it.
the benneli M4 is PIMP, but ill buy enough 870's to gear up 2 familys for the price of one M4