I think your suggestion is misleading Robbo. Have you used Kinetix or SPL parts?
I have the engineering is fantastic. My whole car is fully bushes with the SPL solid monoball bushings from Superpro/ energy suspension combo and there is no squeaking, rattling or banging. There is an increase in NVH as the solid bushes transfer all the road noise into the cabin via the chassis. I can even go one step further to say that there is minimal difference between my polybush setup with the solid bushes wrt NVH.
I agree that urethane will outlast the OEM bushes but not a poorly designed one. Superpro, whiteline are well designed and probably up there. Overall energy suspension are good but their compression bushing is not as well engineered and would cause bind imho. From what I see looks like prothane are ok but we await your feedback being the first to try them on.
We shouldn't forget that these cars are mostly a decade now and when upgrading some areas it can expose problems that were concealed by the good dampening effect of the OEM rubber bushes. So strange noises, knocks etc need to be investigated thouroughly. I've seen front top mounts that were completely seperated due to rust, worn/shrunken bump stops etc as all accuse for strange noises after bushing change.