The brands to look at are Benelli, Beretta and Remington.
Can you get a Benelli for under a grand?
Find a Japanese made Browning A-5. They’re no longer in production but there are plenty of these “humpbacks” still in circulation.
Benelli is king of the automatic combat type shotguns. For a pump, I'd go with the tried and true, inexpensive Mossberg 500. I love'em.
We have had a few Brownings and have loved them. 12 gauge Slug guns for deer hunting, one that shot 3 1/2 inch shells for Turkey and a 20 gauge upland. All have worked flawlessly with cheap and high quality shells.