I've never shot a Stoeger, but one of the guys I shoot with had recently purchased one, I'm not sure of the model. The first one literally fell apart, during shooting. It was replaced, and he had the same outcome, damage to the hand guard. I'm sure there are plenty of people who've had good results, but the internet is filled with bad reviews, some justified, some hearsay.
The Stoger you mention is actually a waterfowl gun, are you planning on using it for hunting ? Are you looking for an all around gun to shoot clay pigeons, or are you looking for an actual trap gun ? Trap guns are designed to hit rising targets and their barrel geometry is designed to accommodate this activity. If you are not interested in trap shooting, it would wise to look at shotguns that can be used in all of the clay games ( Skeet, Sporting Clays, Trap ). These guns tend to shoot flatter, and their patterns are closer to 50 / 50 .
You may be better suited to buy a higher quality used gun, than a new gun of lesser quality. I purchased a used Beretta 390 ST, manufactured in 1992, for $465. Its a classic autoloader. A friend recently purchased a used Beretta A303, the predecessor to the Beretta 390. The gun was immaculate and manufactured in 1991. He picked it up for $475. Both of these shotguns are in pristine condition, and probably sat in somebody's safe for quite a few years.
If you are looking for an over / under the best value for the money, in my opinion, is Lanber. I have 2097 LUX with 30 inch barrels and 5 extended chokes tubes. Recently Cabelas has been carrying the Lanbers, but you can also get them from CDNN .
http://www.cdnninvestments.com/
You've probably also noticed some differences in the various over / under models. Hunting models are usually weighted in the stock, and tend to weigh less. This comes in handy if you are carrying it in the field. Sporting Models tend to have longer barrels, and