I can't belive no one has mentioned the Benelli Super Black Eagle. It is without a doubt the best shotgun in that price range if you want a semi auto action. None of the other shotguns even come close. The Benelli will go bang, bang, bang, every single time. It is also the easiest to clean out of any semi on the market. The Winchester Super X models don't even come close. The Browning models are no comparison. The Beretta's are close but still a little harder to clean. I have never owned a Vinci but I wouldn't be surprised if it was as good or better. Benelli is the way to go if you are looking for the best semi action.

Now if you are looking for an over under, that opens up a whole new can of worms.