One more thing to think about, if ducks are your main target. What style hunting are you doing? If your using decoy's, a pump is going to work just fine. I use decoys on the weekend and just bring my pump, the reason? You must plug your gun to hold only three shells, I've never had a problem blasting off three shells with this style. If your hunting next to a river and shooting at flying ducks, spend your money and get a semi auto. Always get a camo gun if you've got the money. Just worth the investment for rust issues.
This is just my two cents.