Also look to the Franchi line. I have a Alcione and I absolutely love it. In fact, I just ordered a second barrel set for it. They come prefitted so their is no headspacing. Pretty cool to get a 20ga and 12ga with one gun.

As for the O/U shooting from the auto, it definately makes you a better shot. Only two shells vs having up to five in the auto is a big difference. Also slows down chances at multiples of greater than two, not that I endorse that as a full time practice.