IIRC, the superlift uses drop brackets for the diff, torsion bars, lower a-arms, new knuckles, etc. It still gives you the same ride and flex as the original torsion bar suspension, it just sits higher.
Your other option is a coil over conversion. That's where the really good sticker shock comes in...
I was thinking about this the other day and don't know the answer. Ford's TTB gets a lot of grief from some people, but what other suspension set up on another mid-size trucks gives you something resembling an IFS and is still easy to lift? Lifting a SLA front is expensive, which means an SAS starts to become a lot more doable in terms of $$$ and time.