Danimal,
I've been running the Koni Special Active shocks with H&R springs for a number of years and go to the occasional HPDE/track day with my local PCA group. I originally had original "S" springs on them. I also have Tarret sway bars, front and back. I find that the ride quality is very compliant and civil, and will hold up well as a daily driver. It will absorb the imperfections on the street quite well, but if it's a big dip or massive hole, there's nothing that can save it.
I know I'm going against Koni's recommendation of using aftermarket lowering springs (which you should not do - use the original springs.) My one annoyance that is self inflicted is lowered cars in cities that are not lowered car friendly is not fun. I want to go back to stock but lose the alignment setting which I don't want to give up.
