The mission/use for this gun will help members focus the recommendations.  
If it's going to be waterfowl and clay games, a 12g (I assumed that was the gauge being considered) Superposed would be a nice gun.  But for upland hunting, all the 12g Supers except the Superlight and maybe a short Lightning, would be heavier than I'd want to carry.  The Superlight guns would likely be over the budget by a considerable amount.
If this is an "all 'round gun" to do it all and it has to be 12g, I'd find a gun around 7 lbs, 28" bbls, screw-in chokes.