Have a read on ClubRSX, back in the early days the Koni/GC combination was very popular there. From memory you have to be careful with the Koni front struts as they don't like too much lowering and had a habit of popping when folks ran them too low without enough bump stop. There was another guy on CRSX making parts to fit one of the Koni Race inserts (see HERE) to the standard DC5 housing, and fitting a GC coilover sleeve. This gave the advantage of a much shorter body so there was no risk of bottoming out the shock. If you're up for a bit of fiddling about then that could be an option.