So... from my very recent experience... I paid 3.75 hours labour for fitting my coilovers. I know, weird number, but that did include the tracking setup.
I've done 45k miles, most of that with H&R lowering springs and the mechanic said "nowt wrong with the dampers at all". I've just had the pro street s put on and find them a vast improvement over h&r springs + stock dampers if that sways you at all. Plus, they are height adjustable. So if you find them too "crashy" you can just raise the car 20mm.
Just to add. I considered VWR damper / spring kit. Eibach pro kit / b12s. B14 coilovers. KW V1s. ST-Xs. Before choosing the pro street s.