If you want a double (which is the best way to hunt upland, IMHO), and you need to go new, CZ makes a twin trigger over/under for about $500. Called the Ringneck, I believe.
What's your budget?
I bought a well-used Liberty 12ga SXS for $200. I got lucky, and it shoots to point of aim. It has taken a few doves, quail and hungarians.