Price range?.........Lots of good higher end 12 gauge Browning O/U's for sale.......Fine Firearms?
If you just want an entry level O/U........Mossberg isn't too bad (around $500.00)......... Also, Ruger Red Labels are pretty darn nice ($900.00-$1,200)......CZ makes an O/U as well....The Pheasant runs about 8 to 900 bucks......Lots of Browning Citori's around......I paid $650.00 for a really clean 12......Also got a 20 gauge English stocked for $750.00.....Shop around and you'll find something to your liking.
Make sure your wife throws it up a few times (even better to shoot it).....Some O/U's can bolt you pretty good, if they're lite weights and don't fit well.