The rear suspension on my 86 went from stock uppers and lowers and stock sta-bar, to MM standard, non-adjustable LCAs and FRPP uppers, to the MM PHB, then to a one-off rod ended PM3L, to MM height adjustable LCAs and finally an adjustable MM sta-bar. I pretty much ran Bilsteins after switching to the MM parts and when I went with the PM3L, upped the rear springs from "Cs" to H&R Super Race conventionals. By far, the biggest improvement in forward bite, axle articulation, and overall suspension stabilty/predictability was adding the PM3L. Now, this is not without it's own issues such as upper torque box fatigue, but so far I'm not pushing enough RWHP to make this a primary issue, but it could be a problem.
For a guy wanting to try a nearly bind free rear suspension without going with a T/A, try the PM3L. Of course, you'll need the PHB or Watts for lateral control, and running a PM3L using a FRPP or stock upper will put some tremendous loads on the bushings which will eventually fail. But as an experiment to see the difference before opting for the higher cost options, I'd advise giving it a shot especially if the PHB/Watts component is already part of the plan. Car handles competely different.