Firstable learn about your car study it,measure it, and dial in the number and set up of your; wheels,tires and suspension that you want in order to make your car comfortable. Secondable, if your car raddles all you need to replace are the engine mounts and problem solved. Third you don't need none of us to tell you if your car is worth it low or whatever, most of the ppl will tell you stay low, but they won't deal with your car if you f*** it up,you will.

Anyways if you want a real comfortable ride do the following;
1. All your issues can be solved, no need to rely on us.
2.sell those coilovers and get you some stock ones or buy ones that you want.
3.Get some luxury feel springs/or soft springs from tein or other aftermarket that offer ones of that kind.
4.Get some new luxury feel tires.
5.Get new wheels that will offer clearance for optimum ride quality.
You'll be surprise how soft and smooth your car will feel and handle.