I think eibach and sportline are is the same stuff.
Sway bars and springs looks the same to me.
H&R will lower the car about 1.8"
I think H&R has the best aggressive look for W124.The front will be lowered more then the rear.
( I am not trying to sell my springs, just my real expression on the matter.)
If you put Bilstein shocks and sway bars it will raise the car.
http://www.peachparts.com/shopforum/showthread.php?threadid=19710
Eibach and Bilstein are recommanded by various MB tuners, such as AMG, Carlsson, Lorinser.


Hope this help

Pete regards
PS If you are going to use 17x8" I think you should forget about H&R. It might be too low for the size.