how stiff is the coilover ride compared to the stock springs [/quot
and Eibach pro springs you will not feel any diference in comfort (Same comfort as a stock), but drop not that low for my taste.
If you install Gold-lines or Spotline springs you will lose in comfort litle bit, but it's not that bad as coil overs. I use to have a coil overs and let me tell you... ride was very ,very bumpy... After I installed Eibach Sportline springs I was feeling a big difference Spotlines are way stiffer than stock springs but compare to coil overs they are very nice...
P.S. Yes you will need an Aligment kit, you can buy Eibach alighment kit (front) for $26 -(Two bolts and two nuts).
Also you can buy Hotchkins camber plates (rear) $250 .But it's not nessasary at all. Alighment shop will not be able to do the Alighment on the front w/o front Alighnment kit , but they will do the camber adjastment on the rear by using your stock camber plates...