SS, it seems that no one had warned you about how addictive buying firearms can be. I have found that they are worse than tatoos. I have more of each than I would have ever imagined. Although to my mother's great joy I have more guns than tatoos.
I currently own several( I don't have enough fingers and toes) different shotguns, including a few Mossbergs. My model 500 in 20 ga. will always hold a special place in my heart because it was my first repeating shotgun. It took a butt- load of abuse being carried on Arizona quail hunts by a clumsy teenager, and I still bring it out at least once a season(I've had it for 17 years) just to give it a work out and I can still knock down birds with it.
Don't give up hope on your search for an O/U. Talk with everyone you know and see if you can find one used. I was talking to a guy I work with that doesn't shoot and when I mentioned that I did he said he had a Browning Citori that he hadn't shot in years and gave me a screamin' deal on it.
The Citori was my favorite shotgun for about 4 months until I found a Franchi LAW 12, trigger and action work already done, ambidextrous sling and Trijicon ghost ring sight. I have shot clays with it, and with 9 rounds available I hit most of them(even if it does take 2 or 3 shots).
I tried to attach a picture of the Franchi but was told it was too large,CA