If you want a comfortable right that's lower than stock, the first thing you have to do is get new shocks, because the new springs are going to kill your old ones. You should get adjustable damping shocks. The cheaper ones but not necessarily of poor quality are either Tokico Illuminas or KYB AGX. Softer damping settings mean they will travel more when under load meaning when you hit a bump it will squish rather than bang.

As for springs, to maintain comfort, you should make sure you get progressive rate springs (not Progress, as in brand name). These springs differ from stricter racing springs in that their compression rates are gradual instead of linear, meaning they start out soft but as you apply more load they become increasingly stiff. The linear springs are just that. They are stiff at the beginning and become even stiffer as force is applied. They aren't made to give softer characteristics. Progressive springs are like Eibach Prokit, Neuspeed Sport, and most other stand alone, non adjustable springs. Some adjustable springs are also progressive, though I can't think of names right now.

I've heard many times that Eibach Prokit are even smoother than stock with Tokico Illuminas, yet still have better handling.

If you really want to improve handling, couple these with a thicker rear sway bar. That will keep you from rolling off the onramps by the highway.