Depends on what you are looking for really. I'd be inclined to steer clear of a coilover setup unless you've cash to do it right and intend on tracking the car regular. For the look, an improved ride and the opportunity to right a wrong and get an upgrade in, I'd be leaning towards the lads suggestion of an Eibach spring upgrade. A very cost effective upgrade, even more so as you are dealing with a broken spring at present.