Let's speak hypothetically. If you have $1200 to spend and you really want an O/U (not a pump, bolt, single shot or semi) and you want to maximize your dollars on an O/U that will provide years of use and retain some value what would you look at and why? We are going to assume, for the sake of argument, that all guns will fit with no problems or adjustments necessary.
If a Stoeger Model ? is the best, then why is it the best (because that's what you bought is not a valid point)? If it's a Browning, then which model and why do you like it? If it's Remington, then which model and why or why not (parts availability)? Let's assume that I have never heard of a shotgun before and I am asking for help on what I should be looking for in an O/U. Why do you prefer 26" over 28 or 30"? Why do you prefer to shoot top then bottom? Why do you prefer one choke vs. a different one.
in the $1200 range read below
any browning with "invector plus" chokes.(more common the the plain invector short production years.)
any beretta with changable chokes.
both of those will handle 50k-75k shells before needing firing pins or springs. mine was around 65-75k(i got my browning used)
which barrel you shoot is preference. your chokes are game speific and brand spefic. Italian chokes are generally tighter than most. you can ask briley even chokes of the same size will pattern different.
barrel length is perfence and game specific. 32" barrels in skeet or sporting clays for swing weight but horrible for hunting. every clay game was won at some point with a 24inch barrel.
you can pick up 26 and 28 inch barrel brownings and beretta's for $800-$1200
this brand new browning on gun broker at $1,275, means you can find it cheaper else where.
http://www.gunbroker.com/Auction/ViewItem.aspx?Item=277970441