You might try looking at The Gun Dealer online (they're not a sponsor here for whatever reason though). I was looking for a trap gun for the last few weeks and they have a couple of nice Browning Superposed trap guns with the broadway rib that interested me. I didn't buy one because while at the range this past Sunday, a fellow shooter decided he didn't need his Browning XT anymore and we struck a deal. Later that afternoon, a woman came by the range with her late husbands trap guns and I ended up buying a mint 3200 Competition Trap also. I went from no trap guns to 2 in one day!
Also, I know you said you want an O/U, but if you're just shooting singles, they have the BT-99 on sale right now for under $1700.00, and it's hard to beat for value in a dedicated (singles) trap gun.