Since you like tang safeties, then the two that pop into my head are the Mossberg family and the Browning BPS.
IF you want to really have 1 shotgun for all purposes, you will need to be able to invest in different length barrels, and accept that it will do all things decently, but nothing perfectly.
Personally, I can live with that. IF I had to have only 1 shotgun, and pump was allowed, I'd probably stick to the Rem 870 Super Magnum with 28" barrel. I could use any 2 3/4" or 3" barrel for a regular 870 on it- like a SD barrel, or a cantilevered rifled barrel for mounting scopes and hunting deer, or a 24" SuperMag barrel for brush, or find an older 2 3/4" 30" barrel for trap.
The same goes for the Mossbergs. I believe the 535 is the 3.5" version of the 500, and I think you can swap any 2 3/4 or 3" barrel onto it- but I don't KNOW that.
I do know this is possible with the 870 SuperMagnum.
IF you buy a used Mossberg- get the newest one you can. Before around 1971, they only had 1 action bar [like Winchester Model 12, Ithaca 37, and a host of others], but they now have a 2 bar system [like Rem 870]. The newer it is, the fewer issues with parts replacement.
I really don't like shooting 3 1/2" shells. 4 of them makes my shoulder feel like 40-50 2 3/4" shells, or about 15-25 3" shells.
Yet, it is better to have the capacity and not need it- if you can only have 1 shotgun.
Now, I agree: variety is better.
Yet, you can make the spouse happy by having 1 shotgun, and make yourself happy with 4 different barrels to make it a jack of all trades.
Or, teach her the value of the right tool, and get 4 different shotguns!