My 10 year old son shoots a 20 gauge Yildiz youth OU. Nice gun but doesn't fit me well. I have a 20 gauge Stevens 555 that was similarly priced and fits me like a glove. We've had no issues with either of these weapons.
I have a TriStar in 28. It is not like the current product line. The receiver is blue and has some of the best outta the box shotgun trigger I have seen. I think they are better than the 425 Sporting I had. This gun doesn't have ejectors and that is the only thing I don't like about it...but I can live with it for all of the other pros.
It is my favorite shotgun I shoot.
How much do you want to spend? The Turkish O/Us are okay, but for around $1000 you can get into a Franchi Instinct and have an Italian O/U that blows the others away. You also can find some nice SKBs and Brownings (both Japanese) used for under $1000, if you look hard enough.
Forget the $1000 dollar Italian guns or someone elses used crap. Get a Yildiz 12 ga O/U, also get a 12 or 20 ga semi and throw in the Yildiz YP12 pump for the same $1000 and you can have fun with 3 really reliable and fun guns that will last you forever based on your stated shooting frequency!
Oh, the Mossberg Silver Reserve is a train wreck. Stay far, far, away from them.
The Silver Reserve II is another story. They fixed all of the many issues with the original and re introduced it as the Silver Reserve II. Nice gun.
Stoger seems to make a good pump but the O/U's have had their share of problems. I haven't handled one in a few years so they may have straightened them out but several years ago they were known for doubeling, fails to fire from firing pin issues and not setting the hammers, hard opening, rough machining of internal parts.
CZ makes a nice O/U as are the B guns but the price is pretty steep for an occasional shooter.
If you are in that price range and like shooting trap look at the Tri-Star TT15 trap combo. They also make nice flat rib O/U's also for reasonable prices if the game is sporting clays or skeet.