I kinda like my torsion bar set up. You can raise or lower in minutes, and mine, even really low, rides pretty good! The big downside is the price of the rebuild parts, but since they are original now, that means that in 46 years I'll have to replace them. My steering gear is likely pretty shot as it handles much better after I have just greased it, then three days later it's back to it's sloppy ways. Also the steering effort seems a little high.
Anyway, the point is, for the amount you would have to spend on any other option, you can have the stock stuff rebuilt to like new! They sell spindles for discs, that and a sway bar, and I doubt you will get any better performance from the other options.
