Poly bushes do make the ride harder but by no means bone shaking at all. Powerflex offer purple or black series, purple being for street and what most people will use for fast road use, these are 80sha. If the car shall be for fast road then I would be doing rtab's, wishbone lollipop bushes and droplink bushes. You can then replace other parts with brands such as Meyle HD, as the factory parts wear out.
My e36 currently has the following setup and anyone that has been in it has been very impressed with the comfort and ride.
Being honest I cannot comment on the more road noise as I have no interior at all bar 2 seats and half a dash so as for noise.......... Well let's just say there's plenty of it
BC Racing coilovers (JOM before)
Thicker Eibach front & rear antiroll bars
H&R polyurethane ARB bushes front and rear
Powerflex droplink bushes
Powerflex rear wishbone bushes
If you decide not to go the poly route use a good quality oe aftermarket brand for bushes and ball joints. Your welcome if your local to come for a spin in my car if it helps you out at all.
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