The skunk springs rates are-
Front Spring Rate (Tender / Main): 173 lb-in / 520 lb-in
Rear Spring Rate (Tender / Main): 106 lb-in / 291 lb-in
1 lb-in = 0.0179 kg/mm
The eibachs I can't find rates on with a quick google search so I stopped trying. But I'm fairly sure they are going to be progressive springs just like the skunk 2's, and they probably have a similar ratio of rates front to rear.
My problem with these is that you may go lower in height, reducing weight transfer, which is great, but the rates are out of balance compared to stock rates.
Stock spring rates are, IIRC, 4kg-mm in both the front and rear, making for a car that is reasonably stiff while allowing the rear to come around more in turns (fighting the natural understeer tendancy of a FWD car). Honda did that on purpose of course with the Type-R. FWD cars setup for the track routinely have stiffer springs in the rear, because a good driver wants a FWD car to have a slight tendency to oversteer (IE have the back come around) in corners. A FWD car setup in this way is great on the track with a good driver who knows how to control the car, but kind of dangerous and prone to spinning out on the street under the hands of the average user. So car companies make most all of their cars to have a tendency for understeer, which is safer in street driving. Street lowering springs from skunk2 and Eibach are the same way.
So now with the skunk 2's for instance, you are lower, and slightly stiffer in the rear, but in the fronts are no longer equal like stock, they are almost twice as stiff. This will increase understeer at high cornering levels, giving you less control over the car- if you were racing.
However this is a street car and you aren't (shouldn't be) driving at speed where the back end comes loose anyway. So you will get the look you're after with this setup, and it will probably feel faster than stock, especially on the street. But in all actuality it may be slower or the same if you took it on a track.
And then I have the same things to say here as I did in the other recent thread about my thoughts on lowering springs on stock shocks- save a bit more for adjustable coilovers and recoup a significant % of the money by selling your complete set of EK9 springs and dampers.