I am looking to get a new shotgun for upland bird hunting (Pheasant and Grouse specifically). Since both require a bit of walking I am considering a lighter gun (20 gage). I am looking to spend less than $1000. Got any suggestions? My first and foremost criteria is reliability and durability. Some of the shotguns I am considering are the Remmington 870 Wingmaster, The CZ O/U and The Benelli Super Nova. Would consider a semi-auto as well....but don't know much about them as I have mostly shot pumps.