This belongs in this thread...
http://zilvia.net/f/chat/269702-drag...ans-chime.html
But to answer your question; new bushings would be your best bet. Unless you plan on replacing with all new factory components. If you have no intentions of lowering the car, there is no reason to waste money on adjustable arms. You could purchase spherical bearings to be pressed into the knuckles which would take away a lot of slop on that end of the arm.
Anything is better than what you have now. You're seeing a lot of deflecting in the rearend components right now which is hurting you.