I have a Canvasback 12 ga, bought it in 2009 and it's a tank, heavy but tough. I dropped it in the water while duck hunting 3 years ago, was completely submerged, gave it a cleaning session when I got back home and it is still like new. However I do not shoot clays so I can't evaluate the durability when hundreds of round go through it per session. But I heard good things about the CZ shotguns that Huglu in Turkey manufacture. They are probably the best value for money in the league of new o/u under 1000$.
And then I needed a lighter weight shotgun o/u or sxs for grouse hunting, so I got a Yildiz 20ga 2 years ago, very light, but handling it was like a toy. I traded it finally this summer for a used Marocchi. I love this one despite being a tired shotgun, it is not too light, not too heavy, handles beautifully. It is Italian made but learned that they are not in the same league as Beretta. They are more like Franchis as far as I learned. Cabelas has them now, new of course, but for around 1400$ + tx and shipping... More exepensive than CZ but I recommand them for their balanced design (weight vs handling)