The Eibachs on mine are excellent and I have just this morning got KONI top adjustable rear dampers from C & R Enterprises that will be going on next week. If they are anything like the fronts you can have them like standard or wind them up so its stiff as a board.
I noticed when I took my boge ones off that the car sat higher and thats with the Eibachs on with both, I assume that different makes of dampers have the spring plate welded at different positions.
Also I carry a tool box, trolley jack and axle stands in the boot and coupled with the 18mm MDF acoustic shelf, that all adds a bit of weight to the rear of the car.