u dont have to get the coilover system, i have ground controls on kyb agx's on one of my eg civics right now and i love it, the car is no more than 3 inches off the ground with 195/50's on gsr rims. its an excellent setup.
but i have to get suspension for my hatch and im dead set on Ground Control with Koni Yellows, and after having gc's i dnt think id buy any other coilover, as for the koni yellows i heard with gc's it is the best coilover sleeve setup there is, equivalent to and possibly better than TEIN