I will also be adding Sumo's to my list of options:
https://www.youtube.com/watch?v=xfYFE0eWiQU
Keep in mind most options other than the airbags are just dressed up versions of a helper spring. They can help carry additional load before squatting too far, but they cant really react to the load. IOW if you put 1000# on you'll get one result and if you put 2000# on you'll get a different result.
With self adjusting air bags the end result is always the same, no matter the load.
It all depends on what you want or what you want to live with. Cheap and forget about it, add helpers of some sort, and live with the differing ride profiles. More expensive but always the same result, add the air bags.
In my case I couldn't stand a butt low truck, ever, so I added self adjusting bags and forgot about it. I've used them on 3 different trucks and the only part I've ever had to change was a blow-off valve that got weak. I think about 10 bucks and 5 minutes of time.
One thing to keep in mind that a surprising number of people don't seem to understand is that adding a set of 5000# bags (or helper springs) to your junk does not increase your load carrying capacity by 5000#. It doesn't increase at all, it just allows you to better control your rated load, up to that max of 5000#.