The Winchester SXP Defender is another cheap option, just make sure you look for one that takes chokes. There's a nice FDE one on the EE for 400 (not mine, no idea whose). Whatever you buy, make sure it takes chokes if you plan on hunting with it. I grew up hunting waterfowl, and to me rifle sights have no place on a shotgun, but that is strictly personal preference. Fairly good evidence that after 18" of barrel length your not getting a much tighter group on your shots, but any shorter and they get really loud for everyone. I shot a 21'' Benelli M2 at my old club for years, and everyone would remark how loud it was. Longer barrels swing better, and are definitely preferred if shooting any amount of clay pigeons. Buy what you like, but I'll say it again, make sure it takes chokes.