I think it would behoove the discussion and your eventual selection to identify what makes a good HD shotgun and what what guns have those attributes. IMHO there are a great many shotguns that will serve a component user very well.
At a minimum a HD shotgun should:
1) Be reliable. It would probably be easier to list guns that are not reliable enough than those that are. The main point on this issues seems to be between pumps and auto loaders. Those that advocate pumps rest their argument on the fact that the pump is mechanically more reliable. Those who advocate for auto loaders (or at a minimum find fault with the argument just given) point out that the pump requires human opertion and experience seems to have shown that a good auto loader is more reliable than the human working the slide.
2) Have a light. I am in the camp that sees a light as essential. Most of the critiques I read of having a light on the gun seems to display an ignorance in how to use that tool or at least a lack of fully considering how it might be used.
3) Be a gun you can handle and wield effectively. This is one part hardware and one part software. The gun needs to be something that fits the user and that the user physically is capable or using and manipulating. The user needs to be up to speed on how to do those things.
Almost any reliable shotgun could be used for HD. I find the following to be advantageous in a shotgun dedicated to that purpose. They are in no particular order
A compact package. It may not be essential but I find my guns with 20, 19" and 18.5" barrels respectively to be an advantage. I like shorter LOP stocks that fit the way I shoot.
Tight patterns. Different ammo will perform differently in different guns and chokes and barrel work can affect this. Most guns will pattern tight enough for most houses. Do to my particular circumstances and preferences I like a gun that patterns nice and tight.
Good capacity. I'm sure someone will say that you don't need more than 5 or 6 rounds of 12 gauge etc etc etc. I am also sure there are situations in which that has proven the case. That said I would rather have more than less to the point that weight/length doesn't become a hindrance. I wouldn't run a 26" barrel and an X rail to have 23 rounds, but on my tube gun I have an extension that allows for 7+1 on an 18.5" barrel. My preferred gun is 10 +1 More rounds within reason is an advantage.
Side saddle (on a tube gun). Some people do not like them or think they are needed on a HD gun. I do because the shotgun is a low capacity weapon to begin with and in HD you are likely to only have what is on the gun when you grab it a side saddle with a source of ammo to feed the tube seems prudent. It also allows me to carry slugs, which for some may not be a consideration but for my circumstances etc is something I prefer.
Recoil pad. I think a defense gun ought to be something one trains with and will put a fair number of rounds through. To that end a recoil pad is nice to have
My main "HD shotguns" are a both auto loaders. I think they present advantages over pump guns. I also have pump guns and they are clearly a viable choice and often much cheaper than good autos.
As to guns there are more than I will think of to list that can serve you just fine and they fall all across the price spectrum. Everything from the import clone pump guns like the Hawk 981/982, pardner pump, etc to the Benelli M4 and custom guns from night hawk and Wilson combat and the various Saiga conversions. In sum, you can spend a $150 and have a viable HD gun or spend.
These high dollar guns might do a good job of fulfilling your requirement of a "wicked" gun and they are nice guns but for HD in many respects one reaches the point of diminishing returns pretty quickly on the price scale IMHO.
In sum there are dozens of shotguns that are good choices for HD. There are unfortunately proprtionately many fewer good shot gunners. If the choice was between a benelli M4 on one hand and a pardner pump and a trip to thunder ranch for a week on the other I'd go with the latter if I was serious about HD. Of course if finances permit there is not reason to not get the M4 and a week at thunder ranch.
As for the pics, it is not everyone's cup of tea but it is a gun that has proven boringly reliable and that I have a lot of trigger time on. It is a platform that one runs differently than a tube fed gun but IMHO offers some notable advantages (and of course its own set of quirks).