I think you're giving the air bumps more credit than they're due. Unless you are bombing down the whoops, you don't need them. We mostly do slow crawls that don't jar you much. I've yet to see a crawler use air bumps. Actually, a lot of air shock users don't have any bumpstops. Those who do will just run a regular poly/ruber bumpstop or timbrens. With a set of coilovers, you rarely (if ever) bottom them out.
Think of your uses and available places to wheel and go fast for extended periods. We're unfortunate in that regard...we have no hammers. Your high speed will end up being confined to roads (sucky, huh?)
You are a perfect example of why I say to get a tow rig and an offroad pile. Making a street-legal rig on big tires is expensive! Just think of how much easier this would be with full hydro and no concern about width.
