I'm also in the Beretta/Benelli/Browning camp. I know there are other solid choices out there but it's always these guys for me. The inertia-driven guns are a bit slimmer and simpler than the gas guns, but I find the gas guns cycle light loads a bit better and kick a bit less, all things considered. Fit will be of paramount importance so I would at least try them all out in-store and go from there to see which one lines up easiest out of the box. Some are highly adjustable so a shim here and a spacer there could get one of them from 80% -> 100% with just a screwdriver.
I have a Supernova and I think I've fired like 5 3½" shells out of it, and that's it. I simply see no need for anything more than 3" after having my brain rattled like that (patterning 3½" off a bench in a pump is BRUTAL). Any 3" 12 gauge autoloading B-gun would be my first choice, I'm running a Browning Silver on the autoloader side and have for about 17 years now. Outside of those, I'd probably consider a Winchester or Franchi due to provenance (Winchesters relation to Browning and Franchis to the Beretta group) or a Weatherby due to support (and price, let's face it).