As Billy stated the Bilstein B6 are a good choice.
In the USA the B6 is available in HD ( Heavy duty ) and Sport.
If you look at the specs both shocks have identical valving but the Sport has an internal stop that lessens the stroke by 1".
The 1" doesn't sound like much but makes a major difference in ride comfort on normal streets. Less apt to bottom out against the stop.
Bilstein recommends the Sport for use with lowering springs not on a technical basis but on a liability basis.
They are concerned that if a car is "slammed" or radically dropped more then 2" that the springs can move out of the perch with a longer stroke.
A large drop also changes the rear camber which is non adjustable but will change with ride height.
I run the Bilstein HD's with H&R Sport lowering springs ( about 1-1/2" drop ) and front and rear Sportline swaybars.
I also run a twin turbo M103-12V in a 300CE widebody replica with 10" wide split rims on the rear ( Thanks to Aka$h !! )
I've owned the car from new so I know how the ride quality was off the showroom floor.
The key is to assure that all your rubbers/bushes are to spec or your ride quality deteriorates.
Honestly, maybe because I'm old but my highly modified suspension and drive train feel not much different under normal driving then the day it left the dealer when new !!!
STOCK RIDE / SUSPENSION WITH 17" BORBET TYPE A WHEELS:
H&R SPORTS/BILSTEIN HD'S/18" AMG REPLICA WHEELS:
H&R SPORTS/BILSTEIN HD'S/17" AMG/OZ SPLIT RIMS 10" WIDE REAR:
Ed A.