I'd recommend purchasing 17" wheels with 215/45-17 tires and the Si front and rear sway bars before doing anything with the springs. It might just give you what you're looking for without having to sacrifice too much ride comfort by going with stiffer springs. The vagueness that you attribute to the dampers can also be caused by the flexible tire sidewalls and the relatively flimsy sway bars.
Check this out:
Si Front & Rear Sways on an EX Sedan