The answer for that question depends on what you plan to do with the car. Is it a daily driver, drag racer, or autocross/road racer?
If you're going to replace the rear control arms, I suggest you go for replacements that have a spherical bearing at one end so that the rear axle can pivot freely without inducing suspension bind. They'll alllow more rear tire grip when cornering and when exiting from a corner 'cause the inside rear wheel will stay firmly planted.It would be a street racer / daily driver...