@cleanish_e46 I'm biased... if it's not a race car, OE spec rubber is all you need - unless you prefer needing to see your urologist or dental sugeon due to persistent jarring. not to mention the state of our roads these days.
I've had all of the bushes you mention replaced in the first two years with my e30. it runs Konis & H&R springs. The whole setup is firm, damped, as you'd expect from a BMW. I've also done the same on e46 & e60. Replacing rubber firms things up and restores control, though not to the point my wife or kids complain.
Most proponents of Poly are under 25 or have replaced completely bagged-out bushings with poly, and are of course impressed and amazed at the improvement. By the time you've done everything (each part you stiffen reveals shortcomings of the next bagged-out part), it's the hair-shirt solution. Sounds and looks amazing though bloody uncomfortable to wear. Like I say, if it's a race car, all's great on Poly.
Poly has its application. Unless you're certain you need that incrrease in stiffness, rubber is relatively inexpensive and far more durable than poly, and is the right compromise for everyday and sporting street use. BMW test drivers and development engineers logged thousands of hours developing a workable solution for most people, poly does not feature.