I know of a company not too far away that would be up to the task of building GVR4 coilovers. They are very high quality pieces and arent the cheapest, but when Im ready for coilovers, they are the company I will be resorting to. They are called AMR Engineering, they are out of Seattle, WA. The 2g set is in the $1600 range and the Evo stuff is priced at $1850. I know a few guys local to me who use them. They back their product and Ive heard nothing but great things about them. Im not talking about the typical, "the coilovers handle so nice," from someone who only appreciates a good handling coilover of a smooth surface, face it, coilovers need to handle everything. Many coilovers feel like the car is going to skip off the road when they hit a bump, the AMRs dont do this. One guy I know is a rally racer and the other works for English Racing. Even Lucas English (owner of English) really likes them, and Luke is a very blunt guy.
If someone is legitimately serious about forking out the money for a set, I can bring my stuff up to them once I pull my AGXs and stock springs. Should be able to do so within a few weeks.
They have stuff online and on youtube, if anyones interested.