1G Coilovers.

[Kracka]

I had GroundControls and to be honest they are kinda junk. All they are is a coil spring on a threaded perch; you still need to purchase aftermarket shocks to use them. By the time you purchase the GC's and some nice AGX shocks you might as well just spend a bit more and get a real compete coilover setup.

For you 2G guys, Megan has a nice street-coilover kit for under $1000 so that is worth checking out.

Coilovers, a new rear antisway bar, and a front strut tower brace equal a great handling DSM (assuming you get it aligned and lowered properly). If you are truely hardcore, a set of poly bushings make quite a difference aswell, but they are a real PITA to install.