rabbit21, supposed you're gonna have to work out a budget that you want to spend on coilovers, and consider all the other costs, such as topmounts, cos the standard ones are bad and tend to knock,so new ones should stop all that and tighten up the handling, plus you've got to consider fitting if you are'nt going to fit it and the cost of setting it up properly if you want the coilovers to work properly for your car.
The KTR coilovers seem to have a better review so far over the vmax and gaz, but still early days for them, but KTR do seem to know what thay are doing.