28" barrels are too long for all-round use, and I don't see shorter barrels for sale for it.
3 1/2" 12 ga shells are not needed, and most people don't see any real benefit. If you need that much more shot, a 10ga tends to disburse shot better.
A ported shotgun -- good for recoil, LOUD as hell, louder than a non-ported gun.
If you want an autoloading Remington, the 11-87 is the way to go, you can use 2 /34 or 3" shells, RemChokes (IC is best for slugs and buckshot, Mod for most other shot sizes, and Full for the smaller bird shot (say, smaller than #4 Bird). 1 gun, 3 choke tubes. And with the 21" barrel I mentioned above, you have rifle sights, so you can sight it for slugs, and use the front post like you would a bead for shot shooting.
Thank you, Corporal!