I'm looking at 12 gauge pump shotguns. After searching through the forums here I've narrowed it down to either a Mossberg 500, Remington 870 Express, or Winchester 1300.

I'll want it to be an all-purpose gun (turkey, waterfowl, hogs, coyote, deer). I'm left-handed and a big guy (6'3", 275 lbs). What length barrel should I be getting?

Also, should I get a combo? My price limit is about $325-350, but if I don't need a combo I'd prefer to spend the $250-275 or so for the standard shotgun. If I don't get a combo, what barrel should I get (smooth, rifled, turkey, what choke, etc)? I guess the question is, if I don't get a combo, what barrel is the most flexible?