Serious waterfowler really wants a semi. I go with browning golds myself. Used to use an 1187 for years without trouble. Waterfowl is much more difficult to take down than you pheasant or grouse. Especially if you plan to use steel shot, which is what most of us can afford.
Saying all that, I think its just std operation for every gun owner to own at least one 870 express. I sure don't take em duck hunting, but you got to own one.
Thanks for the suggestions. I know the 870 Express is a good starter gun. If I find that I like duck hunting or at least that I don't suck at duck hunting, I figure I can buy a more expensive gun.
The one in the link was a .410, which is absolutely not what you want for duck hunting. If the model they have in stock is a 12ga, then it would make a very fine starter gun, at a good price. Good luck!