hmmm all those options are good, but theres a new system that just came out not too long ago. u should probably look into it. its from Koni, and its called the FSD. some people call it Koni gold from what i understand, these are their first to be non adjustable. thats because the shock ill adjust itself. the suspension is able to tell what kind of driving ur doing and itll either increase the rebound or dampening(cant remember which) to handle better or decrease it to be softer in the streets. Grassroots motorsports did an article on these and they seemed to like them. u shuld atleast check them out
http://www.koni.com/