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Just to clarify, are you wanting to upgrade your struts (front) and shocks (rear) or just the rears? In either case I'd be inclined to stay stock unless you are willing to pony up $$$ for a quality setup that replaces the shocks and struts along with matched springs.
I've riden in an M5 with PSS9s. It seemed to have better handling performance, but rode quite a bit stiffer than stock - although that's not necessarily bad. I'm partial to Dinan's Stage 3 suspension, because it completely transforms the car, and I think the Koni version is very good if you want to save some $$$ over the JRZs (I have an E39 with both).
I've riden in an M5 with PSS9s. It seemed to have better handling performance, but rode quite a bit stiffer than stock - although that's not necessarily bad. I'm partial to Dinan's Stage 3 suspension, because it completely transforms the car, and I think the Koni version is very good if you want to save some $$$ over the JRZs (I have an E39 with both).
