Polybushes, Coilovers, etc

[moltuae]

Thanks to the wonderful condition of our roads, my S8's suspension is beginning to feel a little loose and rattly again, despite replacing everything on the front end just a few years ago. So it's time for an overhaul again and I'm looking at the options.

I'm also about to change the rear subframe (no holes but it's heavily rusted, plus I replaced the front subframe a couple of years ago), so I'm looking to replace all of the bushes at the back too.

I fitted new Bilstein shocks when the front suspension was done, so they've probably got some life left in them yet, but I've never changed the springs so I think they might be overdue. And since the rear springs will be coming down with the subframe, I think it might be a good time to change those.

So I'm leaning towards genuine parts (where available) but wondering if there are better options. I don't want a firmer ride (in fact I'd prefer it a little softer) but I'd like to get that tight 'new' feeling back and I'd like it to stay feeling tight and new for more than a couple of years this time.

I've considered replacing every bush with polybushes but I've been told that, while they generally last longer, they usually make the ride firmer and have a tendency to squeak.

I'm also wondering if I should go for coilovers, but are there any advantages to these, other than an adjustable ride height (which I don't need)? I'm told that coilovers can also make the ride firmer (which I don't want).

Any suggestions greatly appreciated