I'm looking for a new shotgun. It needs to be suited for field and clay shooting. I have narrowed it down to the remington 870 express, mossberg 500 mariner 9 shot(would get longer barrel), browning BPS hunter, or remington 870 marine magnum(again, i would get a longer barrel). I really like the look of the marine shotguns and think i could use them in the field and in clay shooting if i put a longer barrel on them. WHat are your opinions? Of these picks do you like best?