pick a suspension tuner, heasman, East coast, MCA, DMS etc and follow their advice. I use Zenodampers he only does bikes though
Otherwise you will end up spending more on suspension that you have buget for, dont buy anything before talking to the experts and save money in the long run
you will find that off the self stuff is for the masses, your suspension tuner will revalve the shock according to your needs, dont pay more the $250 a corner for a revalve and dont pay more then $50 for a spring exchange
ohh and pick someone local to you and have patience, perfection does not happen overnight