It would also depend on what you plan on doing with the car...If it's just a cruizer, a quality pair of coilovers is about all you need. If you plan on some drag racing or curvy road excitement, then at least single adjustable and probably double adjustable coilovers are in order. I've used pretty much all the brands mentioned so far and have found little difference between them. When I'm going for more race oriented coilovers, I go either Bilstein or AFCO with the smaller diameter springs and dual adjusters, plus the race inspired coilovers can be run inverted which lowers unsprung weight. The correct angle and mounting methods, along with selecting the correct rate spring is very important regardless of what coilover you use....