ORIGINAL: SP10
A 10 guage is the way to go for waterfowl if money is no object. I do not think you can find a better gun for waterfowl than the Remington SP-10 Magnumfiring 1 3/4 oz. of WingmasterHD shot in #2 for ducks and BB for goose.
I have one and used to use it only for field goose hunting.Caution: if you are a youngster or oldster the weight of this gun is too much to shoot well IMHO
Tom