CZ and DeHann sell shotguns made by Huglu - between $500-$1,000. Both have excellent reputations so far. DeHaan is a bit of an independent who offers personalized service. CZ guns in general are well thought of.
Mossberg sells a Silver Reserve made by Khan. Khan also sells under its own name. Reviews seem to be hit or miss which kinda tells me their QC isn't quite up to snuff yet. Personally I don't think they're quite ready for prime time. Maybe some day but not yet. I can't speak to customer support. While I like Mossberg, it doesn't seem to do so well with the products it chooses to import.
Yildiz are sold under that name thru Academy Sporting Goods, the sole importer, so availability is limited. They only run $350-$550 but so far the press has been good from those who buy them. Support is from a third party whose name I can't recall at the moment, but supposedly has a good reputation.
The above mostly refer to O/Us or SxS but I believe Huglu also makes pumps and autos.
Hataan in another Turkish maker sold thru Legacy Sports. Pumps and autos, in California they're sold thru Big 5 stores, but don't know much about them.
www.Shotgunworld.com is a good resource, there is a lot of info on all these guns
I own a Baikal IZH-27 and like it a lot. In general they are built like a tank. Strong and I think durable but certainly not the lightest, most refined gun out there. At the lower end of the scale in O/Us you have to expect some compromises, it just depends where they are.